Television Crossover Universe

Don't Go Br-Br-Br-Br-Breaking My Heart: Of Groundhogs, Three Strange Men, Particle Accelerators, and Time Bounces 1951 May 30 Three triplets are born to the Ryerson family: Ned, Sandy, and Mitch. (Deduced from later entries. Birthdate from actor who played all three characters, Stephen Tobolowsky.) 1962 February 5 Birth of Ellen Besch; she had a twin sister. (Based on the birthdate of actress Jennifer Jason Leigh, who played Ellen Besch in the film "SWF".) 1965-68 The Ryerson triplets attend Case Western High School at some point along with Phil Connors. (Derived from quote in Groundhog Day. The real-life Case Western Reserve University is in Cleveland, Ohio. Presumably, this school would be, too.) 1971 The twin sister of Ellen Besch drowns. Ellen will later suffer survivor's guilt. (Ellen's sister drowned at age 9; see previous entry.) 1972 New York City business executive Myron Castleman experiences a time loop, or time bounce, of one hour. He discov

I didn't watch Castle at first, but then people kept telling me that it was loaded with crossovers.  I started watching it, and became hooked. 1970 to 1977--MCCLOUD--McCloud works at the 12th Precinct, which is also where Castle works. 1974 to 1982--BARNEY MILLER--Barney Miller works at the 12th Precinct, which is also where Castle works. 1984 to 1992--THE COSBY SHOW--Hudson University has appeared on this show, and on Castle. 1990 to Present--LAW & ORDER--Hudson University has appeared on all the LAW & ORDER shows in the franchise.  Hudson University was also seen in Castle. 1995--CAN'T HURRY LOVE--This show's New York police work at the 12th Precinct, which is also where Castle works. 2000--THE BEAT--This show's New York police work at the 12th Precinct, which is also where Castle works. 2001 to Present--DEGRASSI:  THE NEXT GENERATION--Hudson University has appeared on this show, and on Castle. 2002 to 2009-