When Lionel Luthor shows Clark the video clip of Belle Reve from "Asylum" (3.09), Lex says "I know your secret Clark". However, in "Asylum" he simply states "I know your secret".
Clark says that Lex was in Belle Reve for seven weeks. He was actually in Belle Reve for a month. Seven weeks is the amount of time he can't remember.
When Clark states his mother's name, he says Mara, instead of Lara. Martha on the other hand gets it correct and says Lara.
When Lex sees Clark submerged in Summerholt's tank he is on his side yet, when he asks Lex to help him he's on his back then when the camera pans out, he's on his side again.
When Clark is in the tank recalling his first memories, they should have been seen from his perspective. Instead, the shots are seen from the perspective of Jor-El and Lara.