LAX to Melrose Place (2009)
6 connections
LAX
Lost
You can see advertisments for Oceanic Airlines in a LAX terminal, which is the airline of the plane that crashed on Lost
Veronica Mars
In an episode of Veronica Mars, Veronica's fortune cookie had the numbers that won Hurley from Lost the lottery.
The X-Files
The mugshot of Malcolm T Wiggins from the X-Files episode "Titonus" appears on the wall of a police interrogation room in the Veronica Mars episode "Leave it to Beaver." Also the fictional car rental company Lariat where Mulder & Scully always rented their cars was featured prominently on the Veronica Mars episode "Rat Saw God."
Beverly Hills 90210
Brenda Walsh picks up a Morley smoking habit while in Paris on Beverly Hills 90210
90210
90210 was a continuation of Beverly Hills 90210 years later
Melrose Place (2009)
Melrose Place (2009) was a continuation of Melrose Place which was a spin off of Beverly Hills 90210 that was continued as 90210