Very early on a joke is made on the size of JD's surgical scrub sleeves being too small. In the next scene, they are loose.
The Janitor holds up his new dewalt 12v saw and claims it is 4 horsepower. 4 horse = (745 watts per horse * 4) 2980 watts. A 12v XRP dewalt battery is capable of 2.4 amps which = 28 watts of power.
Near the end, when J.D. and Turk are at the bar, the first flashback to the day J.D. entered their shared dorm room, the footage is flipped - the names written on both their door and the door across the hall are mirrored, and the door opens on the opposite side of the frame from the earlier scene where J.D. walks in on Turk in leotards.
The close-up shot of Dr. Kelso's "painting" (around 09:20) reveals that it is a print, done with the help of a common Photoshop filter.
Dr Cox states that he has thrown a computer out of the window where in fact he throws out the monitor that kind of computer has its own external tower for the C.P.U .