When J.D. tells the group that he's going to take out the TCW, the seating position of Dr Cox changes between the right chair and left chair on the table behind Turk.
In the beginning, when Turk is giving instructions on kissing Rowdy to J.D, he tells him that he closes his eyes too soon. But J.D's back is turned to Turk, so Turk wouldn't be able to see J.D's eyes.