Continuity mistake: When the tired businessman sees the bed in his hotel room, he says "Bed!" and takes off most of his clothes, except for his trousers, and goes into the bed. When Daffy wakes him up by knocking the "Do Not Disturb" sign on his bedroom door, the tired businessman walks out of the room and he is no longer wearing his trousers.
Continuity mistake: When Daffy disturbs the man by hitting the door on his room with a hammer, the man leaves and you can see that Daffy puts one of the fingers of his right hand on his beak. When we see the man going down the lift in the next shot, Daffy no longer has his finger on his beak.