Deliberate mistake: In the opening title sequence, just after the title of the movie is shown, Puss cuts a P with his sabre into a curtain or flag. In the middle of the P, there is cloth remaining, but since he cuts edges all around this to make the Capital P, this cloth should fall away as it is no longer attached to anything, yet it floats in mid air.Carl Missouri
Plot hole: When Puss is being sent to prison near the end of the film a shot is shown of Softpaws effortlessly holding a golden egg with one hand. However, back in the giant's castle none of them were able to carry a single egg without help.
Factual error: The "Great Terror" turns out to be a giant goose, but you see in the shot inside the castle that its footprint is not webbed, even though geese have webbed feet.