The Finder to Veronica Mars
4 connections
The Finder
Bones
The Finder spun off of Bones after a backdoor pilot on that show
CSI: Crime Scene Investigators
An episode of Bones has a reference to a prostitute who worked at the (fictional and from the CSI universe) Tangiers hotel.
The X-Files
Morley cigarettes are smoked by Warrick Brown in a episode of Crime Scene Investigation.
Veronica Mars
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."