It's not unusual to see Toronto depicting New York City for buildings & street scenes, (the tram tracks in inner city streets are a giveaway) & the TTC Subway substituting for MTA (New York). The Toronto cars are big, app. 75 ft long x 10ft wide & very recognisable if you've ever been there.
There's a Bruce Willis movie set in Washington, with scenes shot in the Montreal metro, the giveaway there being the trains colours,(blue) & the rubber-tyred trains. What else, filming in the Vienna U-bahn rather Moscow in Clint Eastwood's Firefox, the L.A. Gold line trying to impersonate an above ground Washington Metro train in the NCIS series, (set in Washington DC but filmed in L.A.)
It's not just the London Underground errors..........