Continuity mistake: As the animated film opens, Charlie Brown's mailbox has a small red flag that is attached to the rear of the mailbox with the flag facing up. At the end of the film, the flag is attached near the front of the box and it is facing down.
Revealing mistake: When the protagonist jumps two of the evil cowboys that are after his jewels, the stuntman on the right tosses aside the rifle in a quick deliberate move pretending to lose it. (00:10:25)
Factual error: In the bar in Cartagena amongst the goods advertised there's a sale of slaves of color ("Negroes"). However the movie is set in the early XIX century and the sale the poster refers to (listing very specific figures) took place in South Carolina in 1769.
Factual error: Carnehan describes himself as a "gunnery sergeant". This is an American rank and no such rank has ever existed in the British Army.
Factual error: When the Chinese are loading crates onto the truck with St Paul's in the background, two much more modern buildings are visible either side of the cathedral - out of keeping with the 1910s/20s setting.
Other mistake: Peter Chang is billed in the opening credits as the one and only Fighting Instructors, plural.
Character mistake: In the fight in the Shaolin temple the Bruce Lee impersonator fights 4 monks who are supposed to attack him simultaneously, and they do, but Miss amazingly obvious openings, to the point of spending long seconds hopping around without attacking. Many martial arts movies feature as Common Mistake the main character facing multiple enemies that fight quite inefficiently, but few are this obvious when it comes to waiting a cue. (00:13:00)
Continuity mistake: The line of traffic on the landing side of Tower Bridge is completely different to when the jaguar lands and the capri lands.
Continuity mistake: When Molly dismounts her horse near the end of the movie the blanket slides off. A second later the blanket appears back on the horse.
Factual error: On their journey, Rooster is bragging about his navy colts, when actually his sidearm is a Colt .45 Peacemaker, also known as an Army Colt M1873.