Visible crew/equipment: Just after Tarzan goes under the stone door, he finds the torches dropped by the bad guys. The flame from one of the torches is reflected in the camera lens, and was caught on tape. It looks like a single, unattached flame is hovering on the stone wall nearby. This is made even better when Tarzan picks up the torch and then drops it, the reflection follows his movements precisely.
Continuity mistake: In the movie, notice how the red sport utility vehicle driven by Bill Paxton goes from shiny and clean to very dirty and dusty, from one shot to the next, all within the same scene.
Other mistake: Wouldn't flying out of the water with the unconscious Z in his arms be kind of tricky for Cutter, as his wings would be soaked?
Factual error: When Pellew engages the first French warship, he gives the order to his helmsman, "Hard to Larboard". In the 18th century, helm orders were given in relation to the position of the tiller, rather than the rudder. A helmsman would push a tiller in the opposite direction he wanted the vessel to turn. This practice continued even when a ship was steered by a wheel, so the man at the wheel would have turned the wheel to starboard..except that he didn't.
Continuity mistake: As Buddy and the kid pull away in the car for the first time, Buddy is staring out the right side of the car. The shot cuts to a different angle and he's looking more toward the left.
Continuity mistake: After Paulie is bought from the pawn shop by Ruby, they are out on the sidewalk talking and if you watch in the background, the same red Mustang turns the corner twice in a row.
Continuity mistake: In the marching band scene they all have long shadows, and then suddenly they have no shadows at all.
Revealing mistake: When the dog with its legs in plaster is walking across the passageway the first time you see it its back legs are moving although they're supposed to be crippled.
Continuity mistake: After Marnie has installed the talisman, we are given a glimpse of her where she is flipped. She had been resting on the giant pumpkin with her right leg hiked up and her right foot resting inside the pumpkin's left eye. But she is flipped, with her left leg hiked up and her left foot resting in the pumpkin's right eye.
Continuity mistake: Sandra and her strong man are pursuing Jack and Bridget. They almost catch up to them and bang up both sides of their wagon in the car chase. Bridget and Jack escape, with eventually Sandra and company in pursuit a way behind them, tracking them on an alien computer. When they reach the power plant where Jack and Bridget are, their car has no damage at all. (01:18:20 - 01:29:05)
Factual error: When the Spanish sink the topsail schooner bringing supplies to Gibraltar, Captain Foster swims to a floating fighting top. The schooner actually had nothing more elaborate than a crosstrees on both masts.