After the family visits Robin's grave, Mr Hammond takes his wife to visit Dr Fairchild. The men would talk briefly in the hallway, where it would be revealed that Robin and Alex were twins.
Mr Sykes would be shown witnessing Wendy's murder. In the theatrical cut, he can still be seen during her chase.
The girls would be passing notes in class, which was Jude telling them about Slick. Kim would be caught with the note and forced to read it aloud to the class. This is why Mr Weller calls Kim "the literary Ms Hammond" when she arrives at the gym late.
Real-Life Relative: Brock Simpson, who plays Nick as a child, is the son of one of the producers.
Remaster: The film didn't receive a digital scan until 2014 when it was released to Blu-ray by Synapse Films. All prior DVD releases had been sourced directly from poor quality VHS and LaserDisc masters. The difference in quality was revolutionary for fans of the film. In previous editions, the muffled audio and dark picture had made certain scenes incomprehensible.
The film was originally supposed to be distributed by Paramount, but they would have opened it in only 300 theaters. Avco Embassy Pictures gave a better offer with 1200 theaters, so the makers chose that company. Paramount would then release a little independent slasher called Friday the 13th (1980). Interestingly enough, Avco Embassy ended up only distributing the film in 300 theatres (by opening in a few markets each month, pulling the film and opening in new markets a month later) due to not having money to go wide immediately, or pay for 1200 prints.
The subplot about Leonard Murch wasn't in the original script. It was added late in the production.