Scully talks with Mulder about his clandestine source: "How do we know he's not just another crackpot whose encyclopedic knowledge of extraterrestrial life isn't derived from reruns of Star Trek?" Later Jeff says "Beam me up, Scotty."
Body-swap part of the plot is the same.
Man in Black Morris Fletcher cameos.
Scully finds the two coins that got fused together from the episode.
Man in Black Morris Fletcher returns.
The Golf game that Morris as Mulder was playing on the office computer.
Episode is playing on the television inside the shape shifter's victim's apartment.
"Dreamland" gets an honorable mention.
mirror routine with Michael McKean & David Duchovny