** David Cross' father is from Leeds.
** Kayvan Novak turns up playing a bomb disposal expert.
* TheOtherDarrin: Doug Whitney is played by Spike Jonze in the first two seasons and Jack [=McBrayer=] in the third. Unlike most cases, it was commented on in the season premiere.
* TheOtherMarty: Dave was originally played by [[Series/BeingHumanUK Russell Tovey]] in the pilot, but wasn't available when the series went into production. He was replaced by Blake Harrison, and all of Dave's scenes had to be reshot.
* ViralMarketing: To promote the series, IFC created a fake website for Thunder Muscle. The URL is now defunct, but the site has been archived [[https://web.archive.org/web/20101030075504/http://www.thundermuscle.net/ here]].