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: John Travolta ran 2 miles a day and danced for 3 hours daily to get in shape for this film.
Trivia: John Travolta's sister and mother have cameo roles in this film. John's sister Ann appears as the pizza lady, and his mother Helen appears as the woman for whom he gets the paint.