Continuity mistake: When Turk is talking to someone about the teenager getting breast implants, in the first shot you can see he is talking to someone in a a blue shirt with a stethoscope - i.e. JD. However after this shot, JD has vanished and the conversation is suddenly with Todd.
Continuity mistake: As Kelso is walking out the door with the blue paint on his face, one hand is on the push bar for the door and the other hand is down. Cut to the shot of him walking out the door and now his right hand is pushing the door open and his left hand is just coming down from pulling the alarm wire above the door loose with no time for him to have changed positions.
Revealing mistake: Watch the line appear on the wall as Kelso cuts through the wall into the "Luxury Suite." The line is being cut with a round, drywall cutting bit such as would be used with a drill or Dremel tool. You can see it spinning as the cut is made. However, when Kelso has pushed down the wall and points the tool at Cox and the Janitor, he is now holding a standard reciprocating saw with a flat blade which would cut very differently than what was shown.
Continuity mistake: While J.D. and Carla are visiting Mrs Wilks near the start she has a tray of food and a bit of paper next to the tray in front of her. In shots of J.D. and Carla the table in front of Mrs Wilks where the food was is completely clear and the food and paper keep reappearing between shots.
Continuity mistake: When Turk marks the location for the surgery on Pvt. Dancer, he makes a horizontal mark on the left side of Dancer's abdomen. You can also see a small scar on Dancer's right side opposite the mark. A couple of shots later, Dancer is shown from the front and the mark has now switched to the right side above the scar.
Revealing mistake: The third time Elliott exposes herself to a patient (this time to the dead one that Dr. Cox is about to pronounce), you can see quite plainly that she doesn't raise her scrub top enough to reveal her breasts. In fact, the shot is wide enough that if she had, her breasts would have been fully visible on camera.
Continuity mistake: When JD tells Carla and Turk that he and Elliot had sex in the kitchen, Elliot is shocked and says "How could you possibly think it's an appropriate conversation for work?". It cuts to JD lifting his hand up and about to answer when it cuts, but now his hand is down.