Continuity mistake: When Paul pours out the pink paint from the tin, only a small amount is shown flowing out of the tin. However, the amount of paint that appears to hit Captain Pilbury on the ground below is far more.
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Continuity mistake: Paul and Barry paint a porthole pink, and paint noughts and crosses on the ship in white paint. However, through the episode when the camera pulls away, you can see that the pink/white paint has mysteriously disappeared.