* ActorAllusion: The third season ChristmasEpisode is called in which Max believes an autistic child is communicating a message from his son is called "Samuel Rising." Miko Hughes, who appeared as an evil alien in three episodes of the second season, played the autistic child in the movie ''Film/MercuryRising''.
* HeyItsThatGuy: Hey, it's [[GreysAnatomy Izzie Stevens]] back when she was a teenage alien! They even have the same first name!
** And those two guys from ''Series/CSIMiami'' and ''Film/DWar''... * crickets*
** And that vampire lady from ''Series/BuffyTheVampireSlayer'' and ''Series/{{Angel}}''
** Not to mention [[Series/TheWestWing Toby]]!