When Parker and Hardison are about to jump on the train, she steps onto the rail in heeled boots. When they land on the train, her boots are flat.
During the big shootout, one thug falls back from being hit before Elliot even aims a gun in his direction.
No way Parker and Hardison could have gone as far from the bomb as they did before the blast.
Hardison tells Elliot that he survived an extra 30 seconds, in the pool, by sucking air from the chair's pneumatic lift. Apart from the fact that the chair was still intact and Hardison was probably lying anyway, the pneumatic cylinder only contains high pressure nitrogen with no breathable oxygen. Even if he had taken a breath from it, the pressure would have blown his lungs out.
Elliot racks the slide of the Glock to eject the chambered round. However, he does so before he releases the magazine, meaning that there would still be a round in the chamber.
At the beginning of the warehouse shootout Eliot comes around the corner firing at the gunmen. He fires approximately 20 times, which alone would be almost impossible without an extended magazine which the pistol did not have. On his second-to-last shot, however, you can see the slide locking to the back indicating an empty magazine. The camera changes to a frontal view and he fires one more time from an empty firearm without reloading.
Parker and Hardison should have jumped onto the train from the approaching side of the overpass, rather than the departing for a safer choice of landing spot.