At 44 minutes in, she is in the tunnel with the severed arm. The fan blades advance and cut off the fingers of the hand as she backs down the tunnel. Suddenly she is pulling the severed hand down the tunnel with her, fingers intact. She then takes it up the ladder, only for it to disappear again when she emerges.
@ 41 minutes when Adam's forearm is severed by the glass it is shown next to the wall in the chamber. However, when Lisa wakes up in the next scene the forearm is in a completely different position away from both the wall and the glass.