So far this is the only episode of Peep Show that has been given an 18 certificate by the BBFC, consequently the Series 1 DVD is labelled with the 18 logo. This is because of the gay porn video featured in it.
In the hotel room, Jeff is watching the popular British show Inspector Morse, which ran from 1987-2000.
At the start of part 2, you can see the real life name of the block of flats. The real name is Zodiac House, with the Apollo House sign placed over it.
The only episode to show flashbacks of an earlier memory (Jeremy's attempt to recall "the bad thing").