Continuity mistake: When Elmer opens the door and finds Bugs at the dressing table in ladies' underwear, you can see the door is positioned on the left hand side of the frame. But when we see Bugs, the door is now on the right hand side.
Continuity mistake: When we see Elmer reading his book at the beginning of the cartoon, the strap of his gun switches shoulders between shots.
Continuity mistake: When Jerry runs onto the record player, he runs next to a button panel and there are four buttons on it: Fast, Stop, Start and Change. But when he is pressing random buttons later on in the cartoon, a "Record" button has been added and the "Change" button has disappeared.
Continuity mistake: When Daffy sees Dr Jerkyl's house, he is holding a telegram in his hand that disappears when we see him in the next shot.
Continuity mistake: When one of the doctors touches Donald's stomach with a stethoscope, Donald has his hat on his head, but when Donald is pulled off in the next shot, his hat has disappeared.
Continuity mistake: When Bugs is holding the stick of dynamite in his left hand, he puts the other hand in his ear to avoid the explosion. You can see that Bugs is holding the stick with all of his fingers, but when we see a close-up of the stick in the next shot, he is holding it with only two fingers.
Continuity mistake: When Porky is about to put the pole down into the ground, you can see that there's nothing behind him, but in the next shot trees have suddenly appeared.