The homeless man being taken care of by Lucy Knight vomits near the admit desk near Abby Lockhart; when the camera moves away, there is no vomit on the floor.
When Malucci reacts to Jing-Lei in her little black dress, he is obviously looking at the other side of the admin desk to the front right of Abby. However, in the next shot, she walks up from the direction of the whiteboard which is to the right BEHIND Abby.
When Carol asks Luka if she can borrow Abby for another patient the boom mic can be seen reflected in the x-ray screens behind.