American Horror Story to Kingdom Hospital

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."

In an episode of Veronica Mars, Veronica's fortune cookie had the numbers that won Hurley from Lost the lottery.

On a balloon capsule on Lost all of its sponsors are listed and among them is Nozz-a-la Cola. Nozz-a-la Cola is a fictional product created by Stephen King & mentioned and consumed in Kingdom Hospital