The film's signature long boat chase along the canals of Amsterdam prefigured the long boat chase in the James Bond movie Live and Let Die (1973) by two years whilst later Amsterdamned (1988) would also feature a long Amsterdam canal boat chase.
Paul, what are you thinking?
Paul Sherman: I was thinking about my ex-wife, as a matter of fact.
Maggie: What was she like?
Paul Sherman: Very affectionate... with other men. My fault - I was never there.
In a stunt shot during a fight on a dockside, as one crook is thrown into the water, one of the recovery diver's bright yellow air tanks is visible just below the water surface.
Some topless nudity and shots of a man's bloody face during a hotel fight was cut from the film for an 'AA' rating (suitable for persons of 14 and over) for the UK cinema release though this was restored in video releases and TV showings.