With very few exceptions (and apart from establishing shots of locations at the beginning of scenes) every shot is from a character's point of view (as if the viewer is seeing things through their eyes). Also, every single scene features either Mark or Jeremy, if not both.
Jeremy and Super Hans constantly change the name of their band from episode to episode. In The Interview (2003) Super Hans says it's called The Hair Blair Bunch or Spunk Bubble, Jeremy says it's Momma's Kumquat, in University Challenge (2004) it's Coming Up For Blair, in Holiday (2007) it's Various Artists ("to fuck over people with iPods") and in Jeremy's Manager (2008) it's Curse These Metal Hands. In Man Jam (2010), they join a band called Man Feelings. Jeremy gets kicked out of it but when he gets a job working for Ben's website he promises to get them featured on it on the condition they change their name to Danny Dyer's Chocolate Homunculus. In Jeremy Therapised (2012) Super Hans decide to officially end the band but neither of them can remember what it's called, Jeremy guesses it's 13 Bastards.
In an interview for The Culture Show (2004) Jesse Armstrong and Sam Bain said that two of the main inspirations for Peep Show were the scene in Annie Hall (1977) where Alvy and Annie are talking and their real thoughts are shown as subtitles, and also the documentary Alt-TV (2000) (which in turn was inspired by Dans la peau de John Malkovich (1999)), which used a POV style of filming that they thought was an arresting technique which would go well with the inner thoughts/voice-overs of Mark and Jeremy. They also cited Danny in Withnail et moi (1987) as an inspiration for the quirky, drug-addled Super Hans (also the dynamic of an even weirder third character alongside a double act).
In the first two series, the flat scenes were filmed in a real flat in Zodiac Court, Croydon (renamed as Apollo House in the show). However before series 3 began shooting the owners of the flat demanded more money and the producers decided to film the flat scenes in a studio with a set replicating the flat interior. Since then this is how the flat scenes have been filmed, with exterior shots of Zodiac Court tower block used as inserts between scenes. The studio for series 3 and 4 was a former carpet warehouse in Neasden, for series 5 and 6 a disused army barracks in Mill Hill was used and series 7 was filmed in the former studio of the now-cancelled The Bill (1984) in Merton.
Super Hans was originally written with Danny Dyer in mind. Russell Brand also auditioned for the part and Jake Wood was one of the final three before Matt King was cast.