Continuity mistake: When Jerry appears from the hair of the toy lion, you can see that behind him there is a decoration and some purple baubles. In the next shot, the decoration has disappeared and the baubles are now much closer to the lion.
Continuity mistake: When we first see the refrigerator at the beginning of the cartoon, you can on the shelf underneath the celery there is a yellow container. In the next shot, the container has changed into two cream filled rolls.
Continuity mistake: When Bugs puts up a "Camp Here" sign near his hole, you can see there is nothing behind the sign, but in the next shot a tree has suddenly appeared.