DI Goodman says of the murder weapon "is this a dagger which I see before me?", which is a line from William Shakespeare's famous play Macbeth.
1 East Caribbean Dollar (XCD) is worth 0.37 United State Dollars (USD). 6000 XCD equals 2,220 USD; 120,000 XCD equals 44,400 USD.
Jason Hughes's character saying "We should call the police" (with DI Goodman replying 'I am the police") could be considered a bit of an in-joke, as he played detective sergeant Ben Jones (and other ranks) on no less than 53 episodes of Midsomer Murders (1997).
Kerry Fox and Jason Hughs played Betty DeQuetteville and Ben Jones in Midsomer Murders "The Dark Rider" 2012 s15e1.
Danny John-Jules (Dwayne Myers) & Angela Bruce (Ernestine Gray) also worked together on episode 2.6 Parallel Universe (1988) of Red Dwarf (1988) as Cat & Deb Lister respectively.