This episode marks April's (Catherine Shepherd) second appearance on the show, her first being the series 2 episode, University Challenge, produced nearly 11 years prior.
According to the Peep Show Podcast, Podcast Secrets of the Pharaohs, the character name of "Angus" was written before Angus Wright was cast.
With a forty episode berth between first (S1E5) and second episodic appearance (S9E3), Catherine Shepherd's reprise of the role of April constitutes the longest span between appearances of any Peep Show cast member. Two actors share the honor of having the second-furthest distance between appearances as the same character: Dolly Wells as Toni's sister Paula, and Sonny Muslim as Clean Shirt Boy (both in S1E1 and S5E1) with a 23-episode gap.