Continuity mistake: Near the end, when Ted catches evil robot Bill's head, the position of Bill's head changes in the next shot.
Continuity mistake: After getting the fake phone call from Joanna (evil Bill using her voice), Bill and Ted are sitting on the couch in their apartment. There's a knock on the door and Bill puts his hat on sideways. But when he opens the door, his hat is on backwards without adjusting it while walking to the door.
Continuity mistake: When Missy opens the book in the seance, she is holding a separate piece of paper on the pages of the book. The close up from behind, over her hand, shows no piece of paper. When the camera is in front of her, she is holding the paper again.
Continuity mistake: When Bill, Ted and their girlfriends are sitting at a table talking, Ted says "You probably noticed we haven't given you our gifts yet" with Pepsi cans visible on the table. After a close up of Bill then Ted, the camera goes back to a shot of all four sitting at the table, and the Pepsi cans have changed positions. (00:12:50)
Continuity mistake: After the Evil Bill and Ted knock on the Good Bill and Ted's door, good Bill reaches out to shake Evil Bill's hand. The camera switches to a behind shot of Good Bill and he reaches his hand out again. (00:19:35)
Chosen answer: Kimberley Kates (who played Elizabeth in the first film) said in an interview on a B&T fan podcast that she and Diane Franklin were scheduled to reprise the roles, but then heard that they had been recast. She believed it was because the English director Peter Hewitt did not like English characters being played by American actresses.
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