Other mistake: When Nica reverts back to her normal self and collapses, when she says "Where am I?", her legs noticeably move a few inches. She's paralyzed, so this shouldn't happen. It happens at least one other time during the scene, albeit more subtly. (When Chucky is in control, he's able to move her legs almost like a flesh-puppet, but when she's in control, she can't.)