In the final driving action sequence in Rumorosa, Mexico, the road was actually closed off because of weird occurances. On the DVD Documentary of LTK, it even said that when Sanchez was exploding, a fiery hand was reaching out of the fire. Note: You can probably see this only on the Documentary Special Feature of Licence to Kill on DVD. But even I have to admit that it was pretty amazing.
Not really a mistake, because it's said by a desperate man, but it amused me. Bond's got the DEA traitor hanging over a shark, and the only way the traitor can escape is with Bond's help. He says to Bond "there's 2 million dollars in that suitcase - I'll split it with you". How stupid does he think Bond is? James can either rescue this bloke he obviously wants to kill and get $1 million, or he can let him die and keep all $2 million for himself. Let me think...
'Licence To Kill' is probably the most violent of all the Bond movies in the series. That's according the UK censors, the British Board of Film Classification (BBFC). Every Bond movie from "Dr. No" to "The Living Daylights" inclusive carried a "PG (Parental Guidance)" certificate for UK release. Every Bond movie since "GoldenEye" has carried a "12" certificate. But 'Licence To Kill' had a "15" certificate for its UK release. [Debateable, as the 12 certificate was only introduced with the release of Batman, which came out shortly afterwards, but still likely, as otherwise presumably this movie would have prompted the 12.]
Regardless of the fact that there is a tube down Timothy Dalton's arm to make the flame bigger, it still took Timothy (James Bond), David (Felix Leiter) and Priscilla (Della Leiter) by surprise. The reactions are the real ones of the actors.