You know how TV shows will have those cutesy little nods to other tv shows? Like, "hey, that character was from that one show!" or "they smoked that kind of fictional cigarette on that other show!"
Well now, those have gotten so out of control to the point where Law & Order, Friends, Buffy the Vampire Slayer, Doctor Who, I Love Lucy, Star Trek and about 270 other tv shows can all be connected to one another AND MAKE SENSE by way of St. Elsewhere, where all the events of the show (including all their little nods to other shows, and so on and so forth) all took place in the imagination of Tommy Westphall, a kid with autism.
So any seeming plot or universe inconsistencies between these shows can be chalked up to Tommy Westphall's autism and vividly inconsistent imagination