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 is trying to tell the businessman about the joke he heard, you can see that the bed is positioned against the wall. When Elmer comes in and tells Daffy to be quiet, the bed is now in the middle of the room.
Continuity mistake: When Daffy comes up the stairs laughing and enters the businessman's suite, the number of 666 on the door is different to that when Daffy and the businessman arrived at the suite earlier in the cartoon.
Continuity mistake: When Daffy finds the key to Suite 666, the shape of the keyhole is that of a normal key. In the next shot, it is round.
Continuity mistake: When we see Elmer pressing the bell at the start of the cartoon, there is a book by the bell on the reception desk. When Elmer tells Daffy to take the businessman to Suite 666, the book has gone.
Continuity mistake: When Elmer runs back from the boiler room to the businessman's room, you can see that he has a bandage on his head, but when he runs from elevator to the room, the bandage disappears. It re-appears when Elmer is in the businessman's room.
Continuity mistake: Before Elmer puts pillows on the radiator in the businessman's room, there is a whistle on the radiator that wasn't there previously when Daffy discovers it was 'on the fritz'.
Continuity mistake: At the start of the cartoon, you can see the bell is at the far end of the reception desk, but when the businessman goes to punch Elmer after being woken up by Daffy laughing, the bell is now positioned further up the desk.
Continuity mistake: When Daffy puts the suitcases in the man's arms before going into the lift, there are two suitcases on the top of the pile. When Daffy and the man leave the lift, there is only one suitcase on top.
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.