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.
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.