If you look to the left hand side of this page, you'll see two websites listed near the top: "Crossovers & Spinoffs" and "Crossovers via Tommy Westphall". These two sites are the best when it comes to listing the official links between various series in the TV Universe.
The one that supports Tom Fontana's contention that ALL TV shows are to be found within Tommy's autistic mind on 'St. Elsewhere' appears to list more shows, but Thom Holbrooke's page goes into greater detail about many of them.
But neither of them deal with the connections between the shows where real-life people appear as fictional versions of themselves, or between shows that use real game shows and reality series as their settings, that sort of thing. So that's where I come in. With Inner Toob, I fill in the blanks, the cracks in the unified whole. With those theoretical crossovers and "missing links", I supply the cosmic caulking.
But it just might be that Thom's finally viewing things my way!
At that page, you'll find an excellent splainin as to why 'Magnum P.I.' and 'Hawaii Five-0' should be considered as being in the same TV dimension. It's the type of logic we would have used over here.
It's just a shame his theory about a connection between 'Magnum P.I.' and 'Quantum Leap' couldn't work out.
Anyway, check it out. His articles about crossovers are always entertaining.