Trivia: When Tony Manero's father slaps him on the back of the head during an argument at the dinner table, Tony replies, "Would you just watch the hair? You know, I work on my hair a long time and you hit it! He hits my hair!" John Travolta ad-libbed this line. Director John Badham thought it was so perfect for the character of Tony Manero that he decided to leave it in the film.
Trivia: Jackie Gleason's character is Buford T. Justice. This was the name of a real Florida Highway Patrolman known to Burt Reynolds' father who was once Chief of Police of Jupiter, Florida.
Trivia: In the scene in which Alvy and Annie are watching people in the park and Alvy comments, "Oh, there goes the winner of the Truman Capote Look-Alike Contest," the passer by is actually Truman Capote, in an un-credited cameo.
Trivia: During the second to the last scene of the movie, Barbara Carrera is trying to help Michael York push a rowboat into the ocean from the shore. As one of the manbeasts runs into the surf towards them, Barbara Carrera screams "Michael, look out"! Michael York's name in the movie is Andre Braddock!
Trivia: The movie's plot is a fictionalized version of ballerina Lesley Browne (who played Amelia in the film) and her real-life family. Her mother, ballerina Mirrow Brown, was close friends with fellow dancer Nora Kaye (Lesley Browne's godmother). The characters of Emma and DeeDee were based on them. Nora Kaye was married to Hollywood director/producer Herbert Ross, who directed the film. Famed dancer Gelsey Kirkland was originally cast to play Amelia, but when she dropped out, Lesley Browne was cast to play a fictionalized version of herself.