At around 28 minutes the cork in the bottle that Richard Griffiths is holding appears to just pop out on its own, apparently unscripted, Griffiths has a quick glance at the bottle then carries on as normal.
When episode originally aired, it included a scene where Richard Griffiths is sitting in a DJ booth playing 'Nowhere Man' by The Beatles as a brandy glass rotates around the turntable. Repeats no longer include this scene due to the licensing rights having expired and the cost of renewing them.
Playing one Wanda Venthem's (Beryl) is Clive Mantle. He would go on to appear opposite Wanda's real life son Benedict Cumberatch in Sherlock: The Hound of Baskerville (2012).
The following actors from this episode previously appeared with Dennis Waterman in The Sweeney (1975). Richard Griffiths (Derek Farrow) appeared in Jack or Knave (1978). Wanda Ventham (Beryl) appeared in Abduction (1975). Roger Sloman (Silver) appeared in Trojan Bus (1975). Dave Atkins (Kenny) appeared in Drag Act (1978). Sandy Ratcliff (Barbara) appeared in Stay Lucky Eh? (1975). Ken Kitson (Shades 1) appeared in Pay Off (1976). And Frank Coda (Woods) appeared in Supersnout (1975) and Sweeney 2 (1978)