Plot hole: Helena is ordered to fly or be thrown off the tower, bearing the brunt for Simon's failure. But the flying apparatus is still up there, and so is her servant who was going to secretly operate it so that Simon could pretend to fly around. All she needs is right there in front of her. She's supposed to be cunning and resourceful, and she could have saved her life simply by following the original plan.
Continuity mistake: When Bugs is in Rocky's hideout, Rocky tells Mugsy to take Bugs to the other room and you can see the door is an entrance to an ordinary room. But when the police arrive later on, the door has changed to the entrance of the house.
Continuity mistake: When Frisky Puppy is looking inside the box at the dump, the fence behind him is grey, but in the next shot it is white.
Continuity mistake: When Porky tells Daffy to arrest Nasty Canasta, you can see the window next the door has four panes of glass, but when Daffy challenges Canasta to a fight, the number of panes has increased.
Revealing mistake: Many of the cavalry soldiers were carrying M-1 Garand rifles (WW2 era rifles).
Continuity mistake: When Spike threatens to kill Tom for giving him the hiccups, you can see that there is a burst paper bag by Spike and there is nothing in Tyke's bed, but when Tom crashes on the ground after climbing onto the house's guttering, the paper bag has disappeared and there is now a pillow and blanket in Tyke's bed.
Continuity mistake: When Egghead Jr. shows Foghorn Leghorn the formula for how he managed to dig him out of the ground, you can see that Egghead has nothing next to him, but in the next shot a spade has suddenly appeared.