Continuity mistake: Gene Hackman and John Shea are both doused with water when they come out of the restroom. In the next shot, their hair is completely dry.
Continuity mistake: Burt is lying at the bank with broken leg flesh dangling. Next shot different angle, not dangling, then dangling again.
Continuity mistake: Fiona Fullerton's eyebrows change from full to plucked and back again all through the film.
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 the soldier finds the other soldier dead, having been hanged from a tree by Indians, he panics and flees. Between shots the halberd weapon he was holding vanishes. (00:22:59)
Continuity mistake: When Clara is chasing Snoopy and Woodstock, she is holding a leash in her hand. When Clara is standing at the top of the stairs and sees Snoopy and Woodstock run past, the leash has disappeared, but when Clara slides down the banister, the leash is back in her hand again.