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Trivia: Doctor Strange casts a spell on the pizza vendor, played by Bruce Campbell, that forces him to repeatedly hit himself. This is similar to a scene from Evil Dead II, which sees Ash, also played by Bruce Campbell, attacked by his own possessed hand.
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Trivia: Winston Duke's line "you bald-headed demon" was improvised.
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Trivia: The "wolf woman" seen in the montage at the start is played by Chris Hemsworth's wife Elsa Pataky.