Factual error: During the car chase scene with the Mustang, the driver of the Mustang repeatedly shifts his automatic transmission from "drive" to L1. Also, one shot during the chase shows that driver's feet using a clutch to shift his automatic.
Factual error: The motorcycle is not right for the period. It looks like a 1970's Kawasaki stripped down. Look at the rear wheel (too big), motor is 2 stroke (not one), and the exhaust has a muffler.
Suggested correction: There is no such thing as a one stroke engine.
I don't really follow the technology, but I happen to know there were at least one-stroke prototypes years ago. That aside, a "single-stroke" is possible, but may depend on how it is defined. That is, there will be an accompanying reverse "stroke" ["to" and "fro"], perhaps categorizing it as two-strokes? The "factual error" and your correction may both be correct, using different perspectives or definitions.
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: The route to Tower Bridge is completely wrong - there are no duel carriageways approaching the bridge from the Tower of London side of the Thames, it's all single roads in that area.
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.