Other mistake: When Elena is taken, Bonnie asks Jeremy for help. She says she needs his blood to cast a location spell to find Elena. But it doesn't make sense. Earlier it was revealed that Elena is adopted, so she and Jeremy don't share the same bloodline and cast could not work well.
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Suggested correction: Elena was adopted by her uncle. Grayson Gilbert (her adoptive father) is John Gilbert's (her biological father) brother. Jeremy (Grayson's son) is actually her cousin, and related by blood.
