Paul (his stunt double) dives through the closing doors just a few yards behind the suited alien who abducts Helena - but now on the floor he looks around and both have somehow completely vanished ahead of him. (Note: A deleted scene shows Morrow immediately following them, which was how he wound up at the aliens' operation center).
When Lowry's injured hand is shown, the first reveal is a substituted hand with pale white skin missing the last joint of the fourth finger. The camera then cuts to an over-the-shoulder view facing him and he's holding up his actual hand and clearly holding his fourth finger folded over, with the last two joints hidden.
During the long walk with the survivor in the silver radiation suit, Alan Carter's commlock device on his belt suddenly vanishes.