Revealing mistake: During the scene when Scrooge is sitting in his armchair by the fire, the animation of the fire is badly looped and you can see it flickering as it finishes a cycle.
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More mistakes in A Christmas Carol
Ebenezer Scrooge: I see you wear a scabbard but no sword.
Ghost of Christmas Present: Indeed! Peace on earth. Goodwill toward men.
Question: What did Belle mean when she said, "I release you, Ebenezer." Was that just a way of saying, "I'm breaking up with you," back in the day?
Answer: Yes. He promised to marry her and she's releasing him from that promise, as she realises he is no longer really in love with her.
Brian Katcher