American Horror Story to Moonlight

Morley Cigrettes, the brand smoked by Cancer Man from the X-Files is smoked on American Horror Story: Murder House

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."

Veronica Mars? fictional Hearst University also is a setting in Moonlight