Corrected entry: At the beginning the Grinch is looking down on Whoville and drumming all his fingers. But when it cuts to another angle, he's suddenly only tapping one of them.
Revealing mistake: When the Grinch hits the Christmas decoration with the cue stick, the ball rolls over the Christmas tree, not under.
Suggested correction: The Grinch picks up the cane, then hits the Christmas ornament with it. The ornament goes past the Christmas tree (in front of it), then knocks the other ornaments off the tree. What is the mistake? The ornament is not supposed to go behind or "under" the tree.
The green branches (i.e. the tree) that the ornament passes over are several inches off the ground, and therefore it shouldn't have rolled over them since it's supposed to be on the ground. In the next shot, we see the ornament rolling on the ground, where it is rolling under the branches before hitting the base and jumping up the tree.
You are correct. I first thought the mistake was talking about a layering issue, where the ornament was supposed to be layered behind the tree, or something. I'm not sure how I misunderstood that, but nonetheless, you're right.
Correction: It doesn't take a minute to go from drumming all fingers to just tapping one of them. They wouldn't need to change scenes for that.
The Grinch is tapping all of his fingers as he looks down at Whoville; then, immediately in the next shot, he's just tapping his index finger. It might not take long for someone to go from tapping all their fingers to just one of them, but we don't see the Grinch adjusting his fingers at all between shots; he just goes from tapping all his fingers to just one finger instantly. I'd say this is a valid mistake.
zenee