Continuity mistake: When Tintin and the two kids are escaping from the submarine lair, the water level keeps changing. It's supposed to be more and more high, but it's lower in some shots.
Continuity mistake: When Woody enters the café and sits at the table, Miss Meanie pours him a glass of water. The glass disappears in the next shot.
Character mistake: During the monopoly game, Peppermint Patty rolls a 12 on the dice but only moves 7 squares.