Continuity mistake: When the light bulbs are going to fall on Tom, you can see there is a crate beside him but in the next shot the crate disappears.
Continuity mistake: When Mr Meek puts Daffy on the baking tray and puts him into the oven, you can see there is nothing near the corner of the oven door, but in the next shot another switch has suddenly appeared.
Other mistake: Holmes appears disguised as a Sikh, complete with turban and beard. Although his face is black, his hands are without any make up and are white as snow.
Continuity mistake: When Droopy is standing the door, he tells the convict he's going to call the cops. At this point you can see there is nothing next to Droopy on the frame, but in the very next shot a hinge has appeared.
Plot hole: When Holmes starts the human chess game, he says, 'Who had entered the lists, the king's pale knight.' This refers to moving the white knight of the king's side. However, the ritual does not mention to which square it should move. Still having three possible squares to move to (since the knight is on its initial square and the game has already started), Holmes knows and indicates that the knight (Dr. Sexton) must move to square F3.