Audio problem: During "We Go Together" at the end, John Travolta's mouth is not in sync with the words "we'll always be like one." He appears to start singing "that's the way it should be" before realizing and correcting his mistake.
Visible crew/equipment: In the soda shop scene where Sandy and Danny are at the jukebox, the reflection of the boom mic is clearly visible in the chrome part of the jukebox. [True of videos and early DVD releases - in later DVD releases the reflection has been removed].
Trivia: Olivia Newton-John had to be sewn into her trousers at the end of the film as the zipper broke. They were put on in the morning and she was not allowed to take them off or go to the restroom while they were on, as the crew would have to waste time sewing them back on.
Question: When everyone is at the Frosty Palace and Rizzo asks Danny if someone is snaking him. Danny says "Oh bite the weenie, Rizz." Then Rizzo says, "With relish. Now What does Rizzo mean by "With relish?"