Revealing mistake: When Tigress is hatching a plan to escape Gongmen Tower after they have been trapped, she looks out over the wall. But take a close look at the archers: they all move in perfect sync, indicating the same animation models were used for all of them.
Audio problem: When Rochefort yells "Finish them off!" during the attempted ambush of the Musketeers, the sound doesn't match his mouth.
Continuity mistake: When Marcus Aquila and Esca set off for the North they are riding horses, Marcus on a dark brown horse, with a short mane and Esca on a bay (you see close ups of them on the horses, and several screen shots of them galloping on them). However, after their first overnight stay in the North, Marcus' Horse is black with a long mane, Esca's bay horse is suddenly a white horse with no explanation for this. His horse remains white for the rest of the movie.
Other mistake: To get revenge against the reds for chopping off his hat, Benny goes inside the house to use the computer to change the woman's lawn mower order. Benny never hits the 'ENTER' key to complete things. Things are completed when he steps on the 'SPACEBAR'. Same thing happens later when Benny is ordering a female flamingo.
Factual error: The wolves in this movie must be some sort of mutant super wolf. North American Grey wolves are not lion sized killing machines. They are typically smaller, by weight, than an average German Shepherd.
Continuity mistake: In the opening scene just before Victoria descends into the cave, she's wearing two headlights, the bigger one is on her right side and the smaller one is on her left side. In the next scene while she is talking to Josh, the position of those two headlights changed. (00:15:10)
Continuity mistake: When Conan first fights Remo, Conan places a blood stain on his forehead by pressing his sword to it. Remo then runs off, and Conan gives chase immediately, pausing only to get Tamara on his horse. The stain is still there when Conan mounts his horse. The next time we see them, Conan and Tamara is still chasing Remo, but now Conan's face is completely clean. It is highly unlikely he would pause in pursuit of one of his father's killers to wash his face. (00:47:55)
Factual error: The security guard in the bank is carrying a revolver as a sidearm but has semi-automatic magazine pouches on his duty belt.
Continuity mistake: Theo spots Grace through the window grate and holds it with his left hand, right hand, left hand when he calls for her. (01:42:45)
Continuity mistake: In the 'match' when he tags with John Cena, Fred is picked up by the rival vampire in a fireman's carry position (kinda like for Cena's Attitude Adjustment), but his head is over the opponent's right shoulder in the first, wide, shot and towards the left shoulder in close-up.
Continuity mistake: In two scenes featuring close-ups of the fireplace days apart, the same logs are burning.
Factual error: Rochester Castle is seen standing alone and isolated from any other settlement. In actual fact it stands on the edge of the City of Rochester and very close to Rochester Cathedral, both of which certainly existed at this time.
Audio problem: During the party at the end of the film, the hand clapping and dancing drifts out significantly out of time and sync with the music.
Continuity mistake: The giant maker compound was purple when Franqcuer was created, but it turned orange when Lucille made another giant flea.