* ActorAllusion: At one point, Alan Eppes appears to have been involved in [[WellIntentionedExtremist an act of civil disobedience gone horribly wrong]] as a younger man. [[spoiler:He wasn't]], but actor Judd Hirsch played a similar role in Sidney Lumet's ''Running On Empty''.
** At the end of "Blackout", Alan turns on the television, saying late night is when they play "the classics", and the theme for ''Series/{{Taxi}}'' starts up.
** When it is discovered that Larry's been living in the Steam Tunnels, Mildred mentions playing ''Dungeons and Dragons'' there. Peter [=MacNicol=] portrayed the male lead of the ''Film/{{Dragonslayer}}'' movie.
* CastTheExpert: Bill Nye as a scientist.
* DirectedByCastMember: Rob Morrow (Don) took the helm on a few episodes.