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: 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.