Continuity mistake: In order to tiptoe across the tacks without being hurt, Tom puts a metal gauntlet on his feet. At this point, you can see the floor is completely covered in tacks, but when Jerry and Nibbles are at the same spot a little later on, the tacks have disappeared.
Revealing mistake: When the traveller crosses the drawbridge towards the end of the cartoon, the edge of the cel is visible.
Continuity mistake: When Sylvester crashes into the bridge after catching hold of the speed boat, the position of Sylvester's head on the bridge changes between shots.
Continuity mistake: When Bugs leads Yosemite Sam and his dragon into the tower containing the explosives, you can see Bugs is holding the Swinging Sword. But when he traps Sam and the dragon in the tower, the sword is missing, and when Bugs is walking away from the castle, he has the sword in his hand again.
Continuity mistake: Marvin the Martian creates three Instant Martians to capture Bugs. Bugs then disposes of one of them by tricking it via the scooter type vehicles, but he then runs into three Martians, when there should be only two left.
Continuity mistake: When Daffy rushes up to take his breakfast from Elmer, you can see the door behind them is closed, but when Elmer tells Daffy he's had enough, the door is now open.
Continuity mistake: When Jeannie is on the settee talking on the telephone, the cord is missing in some shots.
Continuity mistake: When Elmer Fuddstone appears from his cave, there is a sign saying "Elmer Fuddstone" which was not in the previous shot.