Re: episodes that are part of two different TV series
When ER and Chicago Hope both premiered on the same night and time slot, Chicago Hope got slaughtered in the ratings. There was a Picket Fences episode where they go to Chicago Hope and after a disagreement, one character says maybe they should've gone to the other hospital. And the doctor replied that they don't talk about the other hospital there.
Then there is my favorite Picket Fences
episode which didn't make the cut. They just mentioned the FBI agents investigating something weird with cows in Wisconsin but didn't bring up Scully and Mulder by name.
I'm not crazy! All I Really Need to Know I learned by Watching The Wire