Continuity mistake: When Daffy raises the upstairs to show everything downstairs has been destroyed, you can see there is a crushed table next to the elevator. The table disappears in the next shot, and in the shot after that, it is back again.
Continuity mistake: When Elmer decides to have a go on the main control panel, you can see there are no words in the boxes above the buttons, but when he pushes the "Burglar Alarm" button, words have appeared.
Continuity mistake: When Elmer returns to his house after being given a lift back, you can see there is nothing on the front door, but when Elmer walks to the door in the next shot, a handle and a key hole have appeared.
Continuity mistake: When Daffy pushes Elmer onto the bus, you can see that Elmer is in the front of the bus when it drives off, but in the very next shot he is now sitting at the back.
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.