Revealing: If you watch Clark splitting wood in slow-mo, the wood actually splits before he touches it.

Audio problem: When the thief with one arm tells his other two buddies to "check this out" the shot switches to the right side of him. In that shot you can see this guy say "check this out" again.

Plot hole: Chloe discovers that the thieves are using kryptonite tattoos to accelerate their metabolism to hyperspeed, allowing them to reach through the space between atoms in solid objects. That's fine, but this acceleration wouldn't be consciously controlled. The thieves might be able to move through any solid objects, but they certainly wouldn't be able to pick anything up or wear clothes just because they wanted to. The metabolism shift would only affect their living cells, not adjacent nonliving ones.

Continuity: After the encounter in the meat locker, Lex and Clark talk outside Fordman's store. As Lex turns to leave there is a truck driving down the street in Clark's direction. When the camera switches to Clark, the truck, which should be in this shot going behind Clark, is nowhere to be seen.