In the scene where Clark first sees Lana working at the coffee shop, she states that there is a strict dress code that forbids jewelry; however, a few moments later the other girl working at the shop is clearly wearing a necklace.
Principal Kwan states that there were seven football players found to be cheating, but when they coach calls the players out to find out who told Kwan that the coach supplied the answers, there are eight players.
The episode begins with a football game in pouring rain. After the winning goal is scored, the crowd shots show the cheerleaders' hair wet and their uniforms completely dry.
When Clark begins to run down the football pitch, he knocks 4 defensive players out of his way. These are numbers 82, 72, 66 and 55. When he has run many yards, not only does 82 jump and miss him again (from the front) but he jumps over the same 4 players, in the same order they were lined up before, to land in the end zone.
When the coach starts the fire in the office of the Torch, Chloe's Mac screen explodes. When Chloe is trying to escape the room, the screen is intact.
When the coach and clark are fighting in the locker room after clark walks through the fire there is a shadow of a person wearing a hat on the wall behind the coach.
When confronted by the principal the coach gets angry and his TV catches fire. The principal walks out past a fire extinguisher and lets the fire burn. Wouldn't he try to put it out?