"Collins" says that London has nearly the same population as the whole of Australia. In 1984 the population of Australia was 15.5 million and London approx, 7 million.
The title is a pun of "If music be the food of love, play on". A famous quote from the Shakespere Play Twelth Night.
The following actors from this episode later appeared with Dennis Waterman in New Tricks (2003). Larry Lamb (Greg Collins) appeared with him in Last Man Standing: Part Two (2015) (Waterman's last appearance in the show before being replaced by Lamb). Penny Downie (Dee Rogers) appeared in Communal Living (2008). Julianne White (Sandra) appeared in Father's Pride (2007). And Christine Ellerbeck (Boutique Assistant) appeared in Bank Robbery (2006)
Barry Jackson (Mournful) appeared again in The Great Depression of 1994 (1994) as Brian. Christopher Driscoll (Freddy) later appeared in A Fridge Too Far (1994) as Fire Chief. And Peter Quince (Keith) later appeared in Fiddler on the Hoof (1989) as George Lynch.
Barry Jackson (Mournful) previously appeared with Dennis Waterman in Regan (1974) and later appeared with him in Poetic Justice (1991)