Melrose Place (2009) to Person of Interest

Melrose Place (2009) was a continuation of Melrose Place which was a spin off of Beverly Hills 90210 that was continued as 90210

90210 was a spun off of Beverly Hills 90210

Brenda Walsh picks up a Morley smoking habit while in Paris on Beverly Hills 90210

Fringe makes reference to The X-Files classification of files.

In the pilot of Person of Interest John Reese's suspect Diane Hanson has emails numerous characters from Fringe