Other mistake: Clarice handcuffed Hannibal. Apparently Hannibal opted to amputate his own hand, but the next scene shows officers descending on Clarice at the lake shore. Had Hannibal amputated his own hand, she would still have been wearing the other cuff. She wasn't.
Libshoppe
4th Aug 2019
Hannibal (2001)
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Suggested correction: It's not known how much time passed between these two scenes. At least enough for Hannibal to tend to his wound and escape. It's quite possible she found the key during that time.