Continuity mistake: In the scene where Death and Bill are playing Twister, Bill's left hand was on red and his right hand was on green. In the next shot when Death is putting his foot on blue, Bills hands are switched.In the same scene Bill's shoes are on the floor. After he wins they walk over to Death and his shoes are back on. He never had time between all the dialog to put them on.
Continuity mistake: When Bill, Ted and Death are at the gates of heaven, they are all looking up to the gatekeeper, talking to him. Bill and Ted are in the foreground, with Death behind them. However, when we see a shot of them from behind, Death is in front of Bill and Ted.
Continuity mistake: If you watch the concert scenes, the audiences are all different because it was partially taped at Six Flags Magic Mountain and Culver City Studios. Hollywood (From G.L.O.W. Ladies Wrestling circa 1980's) was sitting in the front row on the viewer's right at the S.F.M.M. taping, and she's not there at the C.C.S. taping.
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)Justin Davis