Other mistake: When Daffy uses the elevator-like device to bring the second floor down to the first floor, there is a useless outside door on the second floor.
Design for Leaving (1954)
1 other mistake
Directed by: Robert McKimson
Starring: Mel Blanc, Arthur Q. Bryan
Continuity mistake: When Daffy pushes a button to start the massaging chair, you can see that the button panel is on the arm of the chair, but when we see Elmer receiving a massage, the panel has disappeared.