Plot hole: In the end of the movie, when Willy Wonka decides to visit his father, his father does not recognize him until he looks at his "rare teeth." But the wall of newspaper printings that Charlie was looking at included a recent enough picture of Willy that the father would have definitely recognized him, before seeing his teeth, as Willy doesn't look like a normal person with that outfit.
Other mistake: In the beginning of the song about Augustus Gloop, computer generated Oompa Loompas can be seen running through the Chocolate Room, preparing to sing their song. In the DVD release, some Oompa Loompas can be seen running to places that no real person could possibly stand on. This mistake was later corrected in the Blu-Ray release.
Grandpa Joe: Mr. Wonka! I don't know if you remember me, but I used to work here in the factory.
Willy Wonka: Were you one of those despicable spies who everyday tried to steal my life's work and sell it to those parasitic copycat candy making cads?
Grandpa Joe: No, sir.
Willy Wonka: Then wonderful, welcome back.
Trivia: In the scene with the young Willy Wonka eating a box of chocolates, he is writing down in a notebook a description of each chocolate he eats. When Roald Dahl was at boarding school there was a Cadbury's factory nearby that used the pupils as testers for their new chocolate, and they were asked to write down their comments in much the same way. This is mentioned in his book Boy.
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