Corrected entry: In the 23rd episode of season 5, Turk tells JD he hasn't noticed Kim because she wears a wedding ring. He then goes on to cite that she was there during his first day and at Ben's funeral. It then shows clips of these two scenes. In his "first day" scene taken from the pilot episode, Kim is shown between JD and Carla as JD is celebrating, but was absent from this scene in the first episode. During Ben's funeral, Kim is shown sitting behind and between JD and Dr. Cox, which is a seat taken by Carla during the actual scene.
Corrected entry: At one point, it is revealed that the Janitor's name in the show is Neil Flynn (the actor's name), and J.D. sees him in a bit part he played in the Harrison Ford movie "The Fugitive." So, in essence, while everyone else are fictional characters, Neil Flynn is playing himself - as a sadistic janitor.Rooster of Doom