In 1x08, Lexi says she tried Stefan's diet, and lasted two weeks. In Bloodlust (the secondo book in Stefan's Diaries, which is BASED off the show) Lexi says that she only drinks animal blood, and is mentioned drinking both volpe and goat blood.
In 1x09 Stefan detto he was the last to see Katherine before she was taken, but in 1x13 Damon was seen rushing in the room where Katherine was shouting "Don't take her!".
In 1x20 Damon detto he woke up (after death), didn't know where he was, went to the church, and watched them take Katherine inside. In 2x04, Katherine is seen on the rode where BOTH Damon...
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