Karen Sisco to LAX
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Karen Sisco
Justified
Karen Sisco (under her new married name) appears as an Assistant Director working with Raylan Given on Justified.
The X-Files
Morleys
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."
Lost
In an episode of Veronica Mars, Veronica's fortune cookie had the numbers that won Hurley from Lost the lottery.
LAX
You can see advertisments for Oceanic Airlines in a LAX terminal, which is the airline of the plane that crashed on Lost