When Mr. Toad first sees a motorcar, his trousers change from grey to orange between shots.
When Brom Bones grabs the barrel of ale, the side with the corked hole is pointed away from him. When the camera moves to show him pulling the cork out it is suddenly facing him.
Just before Brom spots Ichabod for the first time, as he's drinking his beer, his socks suddenly change lengths for a few frames.
When Ichabod is in his bed, writting in his book with a feather pen, his shadow can be seen in the wall next to him, but the pen's shadow is missing.
When the camera pans down over the table outside Ye Olde Schnooker and Schnapps Shoppe, all of the men are asleep. When the camera zooms in to show the dogs waking up, two of the men are awake, one smoking a pipe and the other chewing a blade of wheat. It's possible that the men are simply bored out of their minds.