Revealing mistake: At the end, when all the historical figures are going back into the phone booth, you can see the trap door in the back open and the people go through it. It would be kind of tight to fit all of them in the booth at the same time.
Bill & Ted's Excellent Adventure (1989)
1 revealing mistake - chronological order
Directed by: Stephen Herek
Starring: Keanu Reeves, George Carlin, Alex Winter
Other mistake: Beethoven didn't seem fussed nor resentful of Napoleon being part of the group. Historically he temporarily admired him and wrote the Third Symphony inspired by Napoleon's ideals of Europe's new hope of enlightenment but later despised him after he crowned himself Emperor of France in 1804 and furiously scribbled out his name off the title page of his Third Symphony and named it Eroica which he originally titled it as "Bonaparte Symphony" due to his former admiration of Napoleon.
Trivia: Jane Wiedlin, who plays the role of Joan of Arc, was the guitar player of the rock band The Go-Go's.
More questions & answers from Bill & Ted's Excellent Adventure
Answer: The song is called 'In Time' and it is performed by Robbi Robb.
Alan Sproul