Ricky Gervais's favourite episode.
Series producer Ash Atalla directed the training video from "Training Day" specially for The Office (2001), with presenter Peter Purves dying his hair to make himself appear younger. The video is presented in full on the DVD.
At the very beginning of the episode Stephen Merchant can be heard dubbing the voice of Rowan, when Rowan is talking to David.
The David Brent character was revived for Red Nose Day 2013, where he in turn revived the old Foregone Conclusion song "Equality Street" mentioned here, passing it on to his new young musical protégé.