Other mistake: In the scene when the helicopters arrive over the research center, look at the heli in the bottom right - it just fades out, while one on the left materialises, and the one in the middle changes position. Notice that after all the helicopters have changed place, you can see the helicopter that faded out appear on the helipad. (02:25:25)
Continuity mistake: When the bad guys chase the chariot, there are 5 of them in the car, 3 in front and 2 in the back. Suddenly, the bald man behind the driver is on the opposite side, and the guy he replaces has vanished, leaving 4 in the car. When the car arrives at Central Park, all of the 5 baddies are back in the car, but the actors are different: the chubby copilot with a hat is now a thin man wearing sunglasses, for example.