Continuity mistake: When Sylvester tries to open the front door, you can see there is nothing under the handle, but when Sylvester opens the letterbox in the next shot, a key hole has suddenly appeared.
Continuity mistake: When Bugs takes out the bubble gum, you can see he is holding the gum between two fingers and a thumb. But in a close-up, he is holding the gum at the bottom of the wrapper.
Continuity mistake: When the man comes along to buy one of Yosemite Sam's cigars, the lid of the box says "ATOM" but changes to "ATOMIC" in the next shot.
Continuity mistake: The flagpole on the ledge of the skyscraper with Spike's milk bottle on it was not there originally when Droopy rescued Spike.
Continuity mistake: When Porky Pig falls off the cliff, he has a shrunken harp around his hands and is wearing green shoes. But when he falls into the pot of gold, the shoes and harp have vanished.
Continuity mistake: When Spike grabs the bomb (painted as an apple) from the cockerel, he takes a bite out of it. You can see that when Spike is about to eat it, the eaten part of the bomb is facing his mouth, but in the next shot the eaten part is now facing downwards.