When Nixon and Jonathan are trapped in the crypt after the landslide, Nixon says he can't breathe, and Jonathan says this is because the landslide cut off the air supply. However, we can clearly see beams of sunlight shining in. So, unless the ceiling of the crypt is made of airtight glass, that landslide didn't cut off the entire air supply.
When Lex and Clark are searching for Mr. Kent, Lex has a bandage over his right eye. After Clark discovers Lex trying to call Nixon, Clark storms off and the camera goes to Lex. The bandage is now over his left eye.
Martha Kent is talking to Lana about the Meteor Shower day when Lana gave her a wish. She recalls Lana as sitting on the counter when in fact she was standing on the ground.