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Deliberate mistake: A pot pie in an aluminium pan that just came out of the oven would be extremely hot, but Karen was not only able to tolerate it being shoved into her mouth, she was able to take a bite and hold the hot pie pan in her hand without getting burned. (00:09:44)

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Continuity mistake: When the Christmas carolers were at Karen's house, the front and rear views of the kids differed - in arrangement by their heights and a taller girl visible in the front view but who was not visible (but should have been) in the rear view. (00:08:14)

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Plot hole: On Christmas morning, Karen went to the grocery store (open on Christmas!) where she donated $5,000 via credit card to the "Homeless Mother Shelter." Hours later, the $5,000 already showed up on Chris' laptop as deposited into the shelter's account. It takes days, not hours, for credit card transactions to be processed - especially if the transaction occurs on a holiday. (01:14:10 - 01:23:20)

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Trivia: After chasing the neighbor girl Nia from her hot cocoa stand, Karen said, "And your little dog, too" - equating Karen to the Wicked Witch in "The Wizard of Oz" who said the same to Dorothy regarding Toto. (00:02:15)

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