Continuity mistake: When Dr Cox throws JD's TV remote on the table, it lands upside down near to the magazine on the middle of the table. However, the next shot of the table shows the TV remote facing the right way up and near the corner of the table. Also the magazine seems to have moved slightly away from JD's beer. (00:18:20 - 00:18:55)
Revealing mistake: When Dr. Cox is duct-taping Dan to the bathroom wall, you can see that the tape across Dan's forehead is already stuck before Cox sticks it.
Continuity mistake: When The Janitor and Kelso sits at the bench and Kelso gets up and walks away the bench has straps attached to it lifting it up. The straps weren't there earlier.
Revealing mistake: When Dan is in the tub you can see his dark swimsuit in a few shots.
Answer: This is an American comedian called Scott Thompson, more widely known by his stage name of "Carrot Top".
Tailkinker ★