The Hays Code, the moral code censoring Hollywood movies during its golden age, forced 'Casablanca' to revise its original adulterous ending.

Ingrid Bergman and Humphrey Bogart, the stars of 'Casablanca,' bonded over how little they thought of 'Casablanca.'

'Casablanca,' the iconic World War II-era film, was recut for its German release, with all references to the Nazis removed.

After actress Ingrid Bergman had a child out of wedlock, a Colorado senator proposed granting the government the ability to ban performers deemed morally objectionable.

The most famous line attributed to 'Casablanca'—'Play it again, Sam'—is never said in the movie.

The Hays Code limited the ways horror films could scare audiences

Beginning in 1930, the Hays Code laid out a strict set of guidelines for Hollywood filmmakers to prevent films that might corrupt those with a "susceptible mind." That meant no graphic violence, no sexual relations outside of marriage (or of a homosexual nature), and no interracial relationships, among other dictums.

Rob Reiner fell in love while working on the romantic comedy 'When Harry Met Sally...,' inspiring him to change the movie's ending to make it happier.

Ingrid Bergman left her husband for Italian director Roberto Rossellini, sparking a major scandal in Hollywood's Golden Age.

Explore a critic's list of the best Ingrid Bergman performances, including 'Casablanca,' 'Notorious,' and 'Autumn Sonata.'

Watch 'Hearts of Darkness: A Filmmaker's Apocalypse,' the documentary about Francis Ford Coppola's notorious production behind 'Apocalypse Now,' shot by Coppola's wife, Eleanor.

In 1980, Steven Spielberg added a scene depicting the interior of an alien spaceship to a rerelease of 'Close Encounters of the Third Kind' at the studio's request, but later regretted the decision, believing it depleted the movie's enchanting mystery.

The original ending to 'Rudolph the Red-Nosed Reindeer' was changed after viewers voiced their disappointment

The movie's TV premiere on December, 6, 1964, ended with Santa choosing Rudolph to help him deliver presents across the world. However, young viewers were disappointed that Rudolph never fulfilled his promise to rescue his friends from the Island of Misfit Toys, which he'd promised to do earlier in the film. The producers reworked the ending, correcting the plothole, before the movie was broadcast again in 1965.

How Alfred Hitchcock changed cinema

In 1960, Alfred Hitchcock changed moviegoing with "Psycho." At a time when audiences came and went during screenings, he enforced strict start times, banned late arrivals, and kept plot details secret. The result? A $32M hit that helped shape modern theater etiquette.

The 'golden age' studio system often controlled actors' personal lives

The "Big Five" studio system minted stars, but it also tightly controlled their personal lives. Homosexuality, in particular, was seen as a liability. One example is Rock Hudson, a major star in the 1950s and '60s, who was forced into an arranged marriage with his agent's secretary.

Camus was influenced by American culture, especially literature and jazz

He loved the work of writers like William Faulker and Ernest Hemingway, and loved drinking whiskey and listening to jazz. He also admired the actor Humphrey Bogart and his striking performance in the noir classic "The Big Sleep." He was delighted when his wife gave him a Burberry raincoat, thinking it made him look more like Bogart.

Alfred Hitchcock's 1945 film 'Spellbound,' starring Ingrid Bergman, features a surreal scene designed by Salvador Dalí.

DH Lawrence's novel 'Lady Chatterley's Lover' was banned for obscenity in numerous countries, but small private printings turned it into an underground sensation in the late 1920s.

'Bonnie and Clyde,' the 1967 film starring Warren Beatty and Faye Dunaway, was the first major American movie to feature graphic violence.

Director Arthur Penn used the then-new Squibb technology, which triggered realistic and bloody bullet wounds, to portray graphic violence, at the time a taboo in American cinema.

After a 6-year exile, Ingrid Bergman returned to the US to accept an award for her performance in 'Anastasia.'

The subtle red carpet war

The dress code for the Cannes Film Festival’s red carpet is conservative by today’s standards, leading to conflict with stylists embracing more contemporary looks. While some rules are Cannes’, others are out of their hands because they’re French law.

The 'Movie Brats'—the nickname given to 1970s film directors like Steven Spielberg, Francis Ford Coppola, George Lucas, and others—ushered in a new era of Hollywood.

Sartre wrote an 8-hour screenplay for a Freud biopic

Sartre was hired to write the screenplay for what would eventually become John Huston's 1962 film "Freud: The Secret Passion," about the life of the psychoanalyst. Sartre, however, had trouble sticking to the parameters of Hollywood. An early draft was estimated to be five hours long. Rather than shortening it, as Huston suggested, Sartre extended it to eight hours and was eventually removed from the production.

How Audrey Hepburn became a spy during the Nazi occupation

Despite her status as one of Hollywood’s most beloved actresses, Audrey Hepburn experienced a war-torn childhood in Europe that few people know about. During her upbringing in the Netherlands, the Nazi occupation caused Hepburn to quit her life as a ballerina and made her family go hungry. In the face of adversity, Hepburn bravely carried messages for the Dutch resistance. Learn more about the star’s compelling life before finding fame.

Camus directed a Picasso-penned play

The show, called "Desire Caught by the Tail," was written by Picasso in 1941 while living in Nazi-occupied Paris. It was first staged in 1944, featuring several French intellectuals, including Albert Camus, who directed, as well as Jean-Paul Sartre and Simone de Beauvoir, who had starring roles.

Woody Guthrie wrote an erotic ode to Ingrid Bergman, which was unearthed years later by Guthrie's daughter.

Hitchcock's 'Psycho' broke many established rules in film

Hitchcock flouted convention for “Psycho,” which many consider his masterwork. Hitchcock broke new ground with the 1960 film, with risqué imagery and shocking twists. The film was the most commercially successful in his long and illustrious career.

Francis Ford Coppola began working on 'The Godfather' to bail his production company out of dire financial straits.

Watch Alfred Hitchcock's 1940 film noir, 'Rebecca'

"Rebecca" was Hitchcock's first American film and is the only Hitchcock film to win the Academy Award for best picture. The story, based on a 1938 novel by Daphne du Maurier, is about a widower (played by acting legend Laurence Olivier) and the haunting direction his life takes in her wake.

Hitchcock created his own archetype with the 'Hitchcock Blonde'

The most iconic Hitchcock Blondes from the director’s catalog include Kim Novak, Ingrid Bergman, and Grace Kelly. The roles they played contributed to the gothic and foreboding aesthetics that have come to be associated with Hitchcock’s work.

The Cannes Film Festival was created as a response to fascism

Initially called the International Film Festival, Cannes was created as an alternative to the Venice Film Festival, which French diplomat Philippe Erlanger believed had been politicized by the influence of Hitler and Mussolini.

A number of Hitchcock's most celebrated films are based on novels

Hitchcock’s films are often cited as being literary, and with good reason—many of them are based on works of literature. This list from the Los Angeles Public Library not only names the many novels that were adapted for the screen by Hitchcock, like "Rebecca (1940)," but also provides excellent context for how and why Hitchcock came to make his adaptations.

Ingrid Bergman's first film role was as an extra in the 1932 Swedish film 'Landskamp.'

10 films that influenced Alfred Hitchcock

Hitchcock influenced generations of filmmakers who came after him, but this article focuses on the films that influenced the master himself. Among the titles on the list are Lyman Howe’s “A Ride on a Runaway Train,” which allegedly inspired the sexually charged ending of “North by Northwest,” and Henri-Georges Clouzot’s “Les Diaboliques,” which many people believe is responsible for the pivotal shower scene from “Psycho.”

'Rear Window' was based on a short story by Cornell Woolrich

Hitchcock's 1954 film, which many consider among the director's greatest, was based on Woolrich's 1942 short story "It Had to Be Murder." The story is characteristic of his dark, claustrophobic work.

Hollywood's 'golden age' was controlled by vertically integrated studios

Hollywood in the early to mid-20th century was largely controlled by the "Big Five" studios: Paramount, Warner Bros., Fox, MGM, and RKO. The studios were vertically integrated, overseeing every aspect of film production, distribution, and exhibition. During this era, actors like Cary Grant and Judy Garland were under contract with specific studios—typically for seven years. Garland signed with MGM at age 13, which counted on them to draw audiences.

The first 'Evil Dead' film significantly removed violent scenes in order to earn an 'X' rating in the United Kingdom, prohibiting it from viewers under 18, though police still seized it from video stores as if it were illegal contraband.

The board game Risk was created by an Academy Award-winning screenwriter.

Movies that killed these 17 actors' careers

Hollywood's history is checkered with flubs and successes, and many actors have suffered from portraying specific roles, even if the films were successful. This list goes into 17 acting careers that took a nosedive after a specific role, including Elizabeth Berkley in "Showgirls" and Sofia Coppola in "The Godfather: Part III." Read the rest here.

Hollywood movies' ratings are controlled by the Motion Picture Association

The board, established by a board of parents, has provided ratings (like G, PG, PG-13, R, and NC-17) for Hollywood films since 1968. Although the MPA provides specific criteria for rating films, many of the characteristics (such as "snippets of language that go beyond polite conversation") are subjective.