Casey Stevens had trouble keeping up with Jamie Lee Curtis during the filming of the dance scenes, as she was a well trained dancer who did all her own dance moves while he was inexperienced. A dance double had to be used for Stevens when the dancing got too difficult for him.
According to director Paul Lynch in Going to Pieces: The Rise and Fall of the Slasher Film (2006), he was having difficulty securing financing until Jamie Lee Curtis signed on. Once the film was shot, Paramount expressed interest in distributing the movie, but they only wanted to open it in 300 theaters whereas Avco Embassy Pictures offered to release it in 1200 theaters, so a producers went with Avco. That same year, Paramount released another independent slasher film, Venerdì 13 (1980), which became a much bigger hit than Prom Night.
According to Paul Zaza, the prom scene was shot with actual disco hits that the production company later realized they could not afford the rights to. This gave Zaza a week and a half to create similar, original disco songs for this movie that were close, but not so close that they could be sued.