The logo of the fast food restaurant that J.D. and Turk stop at in the beginning of the episode, "Burger Empire" is in the same style and font as The Star Wars movie "The Empire Strikes Back".
The statement given by Dr. Cox after his son asks about the streaming suggests that Carla is born in 1971, and has been working in the hospital since she was 21-22 years old.
Years before he shows up as "Jimmy the overly touchy orderly", Taran Killam can be seen briefly behind JD and Kim as they have a conversation about how they "technically haven't had sex yet". He is one of the orderlies talking in the hallway.
The full title for this episode is "My Best Friend's Baby's Baby and My Baby's Baby (aka The Baby Episode)"
When Jordan tells Kim and JD about the abortion she had at 19, she mentions her boyfriend's name was Andy. Christa Miller (who portrays Jordan) later goes on to play Ellie Torres in Cougar Town, who is married to an Andy Torres.