When Dr. Mark Sloan is in the hospital bed, he has a bib on his chest that appears and disappears then reappears several times. Besides, the food cover is also moved.
When Mark stumbles and falls, it's apparent that a stunt double is performing the scene, as the wig slips down over his face.
When talking to Norman about the possible suspension of Dr. Karen Fielder, Mark incorrectly uses the the word "infer," instead of the correct "imply."