Karen Sisco to Melrose Place (2009)

Karen Sisco (under her new married name) appears as an Assistant Director working with Raylan Given on Justified.

Morleys

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

90210 was a continuation of Beverly Hills 90210 years later

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