When Daffy Duck has a phone in each hand he breaks them in half.
The next scene the phones are undamaged.
When Daffy gets all the bad guys in the closet, he shoots at the door with a machine gun.
When he opens the door the first bad guy looks like a robot just standing there.
The very next scene the robot has a long red tongue and he is holding a candy cane which was not in the previous scene.
When the mail arrives at the beginning, the mailman raises the flag, but when Daffy runs around to open the mailbox, the flag is down - and he never put it down.