Directed by: John Woo
Starring: Tom Cruise, Ving Rhames, Brendan Gleeson, Thandie Newton, Dougray Scott, Richard Roxburgh, John Polson
Other mistake: Luther tells Ethan that he will only have 40 seconds for the louvres to remain open for him enter the ventilation shaft at Biocyte before the alarm goes off. But the warning message on Luther's computer says that the limit is 20 seconds. (01:06:30 - 01:09:10)
Other mistake: Ambrose smacks a stone on Ethan's forehead. No blood nor even a bruise appears seconds later when Ethan is kicked in the face and we get a close-up of him.
Continuity mistake: The tyres on the crotch rocket motorcycles they were riding kept changing from knobbly tyres to road slicks, back and forth depending on what terrain they were on. Easiest to see when Ethan skids on the road to avoid the white van - clear shot of slick tyres - then about 30 seconds later they're on the dirt, he skids into the old car and you can easily see that he's got off-road tyres front and back.
Ethan Hunt: You turned around.
Nyah Nordoff-Hall: What are you going to do? Spank me?
Trivia: The delays on the MI:2 shoot cost two of the actors high profile roles: Dougray Scott was replaced by Hugh Jackman in X-Men, and Thandie Newton was set to play Lucy Liu's role in Charlie's Angels, but this shoot ran so long that she didn't want to commit to another 6 month shoot immediately, so pulled out.
Question: How did Ethan Hunt know he was going to switch places with Hugh at the end of the film requiring him to take two masks with him to swap different faces?
Answer: The only thing I can think is because they're in Sean Ambrose's hideout, and he's an ex-IMF operative, then he possibly had the gear required in there. Ethan found it before the encounter with Hugh, and it's simply not shown. Other than that, it's an error.