The warehouse filled with tailor's dummies is the same one that was used in Spy Probe (1982) where Ferris and Twig took Doyle to test his shooting abilities.
The following actors from this episode previously appeared with Dennis Waterman in The Sweeney (1975). Roger Hammond (Albert Wendell) appeared in Selected Target (1976). Frank Mills (Harry Martin) appeared in May (1976). And Miranda Forbes (Nurse) appeared in Hard Men (1978)
Frank Mills (Harry Martin) later appeared in The Greatest Show in Willesden (1991) and Gone with the Winchester (1993) as Len and in Thank Your Lucky Stars (2009) as Eric. He also later appeared with Dennis Waterman in Good Work Rewarded (2004)
Ian Bartholomew (Keith Wendell) later appeared in Uneasy Rider (1993) as Ralphy. He also later appeared with Dennis Waterman in A Delicate Touch (2005) and Spare Parts (2008)