Continuity: When Napoleon first comes back from France and he's hanging in the tree, he disappears when the camera angle changes to an aerial view of Bill and Ted.
Quotes
Bill: How's it going, royal ugly dudes? I am the Earl of Preston.
Ted: And I am the Duke of Ted.
King Henry: Put them in the iron maiden.
Bill and Ted: Iron Maiden? Excellent!
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Bill & Ted's Excellent Adventure (1989)
Directed by Stephen Herek, starring Alex Winter, George Carlin, Keanu Reeves (add more)
Bill & Ted's Excellent Adventure mistakes
Other: At the Circle K when future Bill and Ted have finished talking to present Bill and Ted and go back into the phone booth, where are the other 5 historical figures? Especially as it is emphasized that they are all squished together, when they land you can see Beethoven, but he isn't there at the end when they leave.
Continuity: At one point, Bill is on the left inside the phone booth and Ted is on the right. When the camera switches away, then back, they've changed sides. I think it's right before they meet their future selves.
Bill & Ted's Excellent Adventure quotes
Bill: How's it going, royal ugly dudes? I am the Earl of Preston.
Ted: And I am the Duke of Ted.
King Henry: Put them in the iron maiden.
Bill and Ted: Iron Maiden? Excellent!
Teacher: Ted, who was Joan of Arc?
Ted: Noah's wife?
Bill: Ted, while I agree that, in time, our band will be most triumphant, the truth is, Wyld Stallyns will never be a super band until we have Eddie Van Halen on guitar.
Ted: Yes, Bill. But, I do not believe we will get Eddie Van Halen until we have a triumphant video.
Bill: Ted, it's pointless to have a triumphant video before we even have decent instruments.
Ted: Well, how can we have decent instruments when we don't really even know how to play?
Bill: That is why we NEED Eddie Van Halen.
Ted: And THAT is why we need a triumphant video.
Bill/Ted: Excellent.