The high-tech room where the final confrontation occurs is the Resonant Testing Set facility at Powertech Labs in Vancouver.
In a 1983 Jerry Lewis movie, 'Cracking Up', the Jolly Fats Weehawkin (note spelling) Airline has a super-low budget flight to London. The DC3 plane is falling apart and at the gate, if you don't have a gun, the guards will sell you one. In 'The Middleman' we have the Jolly Fats Wehawkin Employment Agency and references to a DC3.