Continuity mistake: When Woody pulls the lever to shock Steve, right before Steve sees the global warming disaster, he breaks the handle and it's in the up/on position. After the vision, in the wide shot, the handle is no longer broken and in the down position. In the next shot it's back up and broken.
Plot hole: When Connie uses the wish machine to make Malloy small again, she instead wished for Ethel's breasts to get significantly bigger. However, in the next scene Ethel's breasts are back to her regular size. The plot shows that the wish doesn't wear off, and someone else would have needed to wish for Ethel's breast to get smaller but no one did.
Factual error: When the militia come in to shoot Woody, they're holding pump action shotguns and you hear them pump them (meaning chamber a round so it's ready to shoot). Even if we assume Malloy and Jorge did not do this, we see/hear them both pump the shotgun twice (without ever shooting in between). However, pumping the shotgun after a round has been chambered will eject the round, in the case of Malloy and Jorge an intact round, not just the shell, would be ejected. However, we never see anything be ejected.
Continuity mistake: When Malloy takes a bite of the lollipop, he does so at the top. When Ethel takes it, the bite is still at the top. But in the next shot, the bite is to the side. Also, when the lollipop is turned over to the other side, the direction the "swirls" go in remains the same. Since it's the opposite side, the direction should go the opposite way.
Continuity mistake: Unsure which episode this is from, but in one episode the cop car arrives towards an accident scene with the typical red and blue lights on the top. Then when coming to a stop, suddenly both lights are red, then changing to a close up shot of the driver's side of the car, the top light is now blue.