John Travolta had worked hard on the "You Should Be Dancing" sequence and threatened to quit the film when the studio suggested it should be shot in close-up instead of full-body.
Production had to be briefly halted so that John Travolta could attend the funeral of his girlfriend Diana Hyland. The couple had earlier appeared in El chico de la burbuja de plástico (1976), their only joint venture. It was Hyland who encouraged Travolta to take the role of Tony Manero.
The iconic poster with John Travolta in a white suit, chest out, one arm pointing up, one arm pointing down was not a "planned" shot; in fact, it was an afterthought at the end of a long day. "It was 14- or 15-hour day and the photographer said, 'Do you have anything else in you?' And I said, 'Oh geez. Okay, how about this? '" remembers Travolta. "The next thing I know was I'm looking at photographs about three months later for poster ideas and I said, 'Oh my God, I can't believe they picked that shot.' I didn't know it would create the iconic figure that it ultimately did."
When John Travolta first saw the rushes, he was greatly upset that his solo dance was cut in close-up. He called Robert Stigwood and relayed his concerns. It didn't seem right, he explained, that he had worked so hard to get in shape and learn a complex dance just to see the sequence cut down in the editing room. It was important to Travolta for audiences to see his work and to know without a doubt that he was doing his own dancing. Stigwood agreed and told Travolta to go back and sit with the editors and personally supervise a new cut of the solo sequence.
When they shot the first bridge scene, director John Badham kept secret from Donna Pescow the fact that when the guys "fell off" the bridge, they actually landed on a platform a few feet below. Badham and the other actors did not tell her about the platform because they wanted a genuine look of horror and anger on Annette's face when Tony, Double J. and Joey appeared to fall off. Therefore, Donna's reaction to them falling, and her facial expressions turning from horror and shock to outright anger, were real, and her next line, "You fuckers!", was not scripted.