Continuity mistake: In the episode where Elliot is missing J.D. and talking to him a lot on her phone, he asks her to drop the phone into Dr. Cox's pocket. She drops it into his left coat pocket, but he later pulls it out of his right coat pocket. He couldn't have changed it in his pocket, because he's surprised to find it.
Continuity mistake: In the apartment there is a cardboard box on a table, with a strip of blue tape on it and a tube of paper sticking out of it. A few shots later another strip of blue tape suddenly appears on the box and the tube of paper has vanished. (00:02:35 - 00:03:15)
Character mistake: When Elliot asks Kelso if there is a special way to communicate with the nurses. Kelso grabs Elliot by the arm and his hand being placed on her sleeve and pull her to the side while still holding her arm, when the camera angels changes from the close-up his hand placement is lower and not on Elliot's sleeve but on her skin. (00:07:00 - 00:07:40)