Continuity mistake: During the fight, Natasha got into the Ford truck's bed and kicked the tailgate open (down). Nobody closes the tailgate, but it is closed (up) when Natasha is standing behind it talking to Jimmy. The closed tailgate is visible when Jimmy is driving away after Ellis and Ask arrived. (00:35:00 - 00:36:25)
Continuity mistake: When Natasha joined Jimmy at the table in the restaurant, there was a plastic bottle of ketchup to the right of their drinks. When the waitress came to their table, the bottle of ketchup was gone. A napkin holder, previously barely visible, was now between their drinks. A little later, there were two small (individual serving) containers of ketchup in front of the napkin holder. (00:07:06 - 00:08:50)
Continuity mistake: After Jimmy got something from the cargo area in his Suburban and returned to the driver's seat and onto the road, he was not wearing his jean jacket. Several seconds later, Jimmy was wearing his jean jacket. (00:52:25)
Continuity mistake: Jimmy did not have sunglasses on when he and Natasha were running toward the airport. Suddenly, when they got close to the airplane, Jimmy was wearing sunglasses. Also, he was no longer wearing his jean jacket and his shirt was unbuttoned. Earlier in the movie, in the restaurant, Jimmy did have sunglasses hanging from a button hole on the left side of his jean jacket, but the sunglasses usually were not attached there or otherwise visible. (01:07:00)
Other mistake: Two goons almost caught up to Jimmy's Suburban when Natasha was driving. It isn't clear what the distance was between the vehicles, but close enough to see the other's vehicle. Natasha slowed down so that she could roll out of the driver's side "unnoticed" - and she somehow managed to do so. (00:47:18)
Continuity mistake: Jimmy's Suburban had a stick-on blind spot mirror on the driver's side (also shown on CCTV when he left the grocery store near the beginning of the movie), but the blind spot mirror was not there when he was driving away to get Natasha on a boat. (01:22:55 - 01:25:58)
Revealing mistake: Jimmy's [Matthew Lawrence] glass of cola on the table is filled to a level slightly above the groove (mortar joint) in the cement block wall. The next front view shows the top of Jimmy's glass slightly above the same groove and the level of cola is about 2" below the groove. A little later, the level of cola in the glass is like it was earlier - slightly above the groove. A cement block wall is stationary and nobody raised or lowered the table; use of a green screen can explain the anomaly. (00:08:05 - 00:08:41)
Revealing mistake: While Jimmy was driving (apparently on a single-lane road), a car passed him on the right and seconds later two cars passed him on the left. (00:25:10)
Other mistake: Natasha may have been a highly skilled, capable, and experienced fighter (simultaneously taking on multiple large goons with weapons), but this would not mean she was indestructible, injury-proof, or immune from pain. During one extensive fighting scene, just the few heavy whacks on her back followed by being thrown onto her stomach from being held above the goon's head should have rendered her incapacitated (at least for a while) but she did not suffer any ill-effects and continued fighting. (00:34:50 - 00:35:20)