FAQ for
The French Connection (1971) More at IMDbPro »

The word "frog" is often used as a derogatory term for someone of French descent. When Popeye refers to Charnier as "Frog One," he's trying to distinguish Charnier from his partner, Pierre Nicoli. It can also be a way to show Popeye's generally bigoted attitude.

He's deliberately trying to confuse Willy into making a confession. Poughkeepsie is a small city about 80 miles north of New York on the Hudson River. Willy may have a drug connection up there that buys product from him and sells it in that region. His line, which is somewhere along the lines of "when was the last time you picked your feet in Poughkeepsie" is basically nonsense. Repeating it and variations of it including only Poughkeepsie or just when the person has last "picked their feet", over and over in a threatening manner, is a tactic meant to bewilder the subject. While the criminal is desperately trying to figure out what this sentence is a code for, the interrogators intersperse the badgering with actual questions like "who's your connection Willie, what's his name!?" and "is it Joe the barber?" The totally confused criminal up against the wall, doesn't know what this Poughkeepsie thing is, but it sounds bad and he sure didn't do it. So to take the questioning away from this mysterious act the police think he's performed, that must be pretty terrible, Willie admits to what they really want to know out of fear. This tactic/phrase was actually developed by the character that Gene Hackman played, in real life (the movie is loosely based on a true story). Source: French Connection Commentary extra found in the DVD version of the movie.

They more than likely bought Devereaux a new car exactly like the old one. Putting the car back together after spending several hours tearing it apart would have taken at least twice as long, plus there was the actual damage they caused to the interior while ripping out upholstery, carpeting & other trim. From there it'd be a simple matter of buying a new Lincoln, pulling out the rocker panels in that one & stashing the heroin & transferring the license plates to it.

So they managed to procure an identical car to this one in the middle of the night in an hour or so? And the bad guys didn't notice anything, even that new car smell? C'mon!