Deliberate mistake: When the penguin goes into the cemetery, he bumps a tombstone and it moves. Almost certainly a tribute to legendarily poor director Ed Wood, who Tim Burton later directed a biopic of - this exact thing happened in one of his films. (00:39:15)
Batman Returns (1992)
1 deliberate mistake
Directed by: Tim Burton
Starring: Christopher Walken, Danny DeVito, Michael Gough, Michael Keaton, Michelle Pfeiffer
Plot hole: When The Penguin is controlling the Batmobile, Batman punches through the floor to take off the transmitter. We still see a video feed of The Penguin. Why? Batman pulled off the transmitter, so there is no reason for there to still be a video feed.
Selina Kyle: Honey, I'm home. Oh, I forgot. I'm not married.
Trivia: The shot where the monkey walks down the stairs to give The Penguin the letter from Batman took many shoots to complete, because Danny DeVito's makeup frightened the monkey.
Hamster
Chosen answer: It is suppose to be his blood.
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Answer: It is poison from Shrek's factory.