When Dr. Romano removes his prosthesis and hurls it through a window, the sleeve of his t-shirt moves from rolled and crumpled to perfectly straight as the camera angle changes.
When Abby is walking with Malik she asks him why he's still working and not striking with the other nurses, he says he's an LVN. Since the series is set in Illinois he'd actually be an LPN.
When Abby is getting ready to walk back in the hospital after reading the letter she throws it in the trash and misses but where she threw it is different from where Frank picked it up. It should have been more in front of the trash can but Frank picked it up on the right side of the can.