This is at the beggining. How long was Adam unconscious in the bath-tub and why the hell didn't he drown? He was obviousley in the tub awhile because the doctor was already conscious, and would have heard the bad guy putting Adam in the tub and moving around.
LoL not exactly a slip up but i know what you mean, I thought the same. Maybe he was sat up, slid down and then came around when he couldnt breathe under the water. The panic making him knock the plug out
While this may seem like a slip-up while watching the movie you see the scene from a different angle in later movies and you can see that his head is not submerged under the water where it is originally placed. So he wasn't under the "water" that whole time