Other mistake: When Lulu is looking at herself in a three sided mirror as a monkey, the reflections do not match up with her position of her hands. Most noticeably with the reflection on the right side. (00:05:40)
Other mistake: When Daffy is helping the guest to his room, he looks at his keys as to which one would open it. When he finds the right key, he somehow manages to open the door without unlocking it.
Other mistake: After the fade out, the "The End" board shows it as an "MGM Tom and Jerry Cartoon." The two stars were not in this short at all.