The producer was Sheldon Leonard, a Bronx-tawkin' character actor who played the bartender in "Its a Wonderful Life" and all manner of Damon Runyon gangsters before becoming a TV producer and making big bucks with "The Andy Griffith Show" and other stuff. In a nicely nostalgic episode, Leonard acted one last time by playing a "Mr. Big" gangster villain on "I Spy," with that great dese-dem-and-dose accent, but he was really a mogul by that time.
Leonard evidently negotiated some sort of deal to use NBC's news and sports bureaus around the world to borrow camera and crew to film all those locations. I assume that interiors -- no matter how "Japanese" or "Mexican" they looked -- were then mocked up on Hollywood soundstages for filming after the location work was finished for the year.
Still, with all that documentary-style location footage, "I Spy" ended up looking and sounding like no other 60's TV show. It was, in some ways, a look forward to the gritty 70's movies.
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The other more backlot-bound and hermetically sealed TV spy shows of the 60's were also a fun lot, though none of them had "I Spy"'s mix of realism, social comment, and travelogue glamour:
"The Man From UNCLE": MGM created this show to mix James Bond and "North by Northwest," Hitchcock's sole MGM film. Robert Vaughn's suave Napoleon Solo (a name given to MGM by Bond creator Ian Fleming from a gangster killed by Goldfinger in that movie) was meant to be the sole lead, but as with Cosby on "I Spy," the "sidekick" was moved up to co-lead status. That would be Brit David McCallum as "Illya Kuryakin," a cute Blond Russian moptop. Just as "I Spy" was promoting racial equality, UNCLE was looking to thaw out the Cold War: The United Network Command for Law Enforcement (UNCLE) was a UN-based international alliance of good guys, Russians included. 60's TV was more progressive than you'd think.
The "North by Northwest" connection: Leo G. Carroll, who played the CIA chief in the Hitchcock movie, played the boss of Napoleon and Illya here. And "UNCLE" usually involved some "innocent bystander" who stumbled into spy plots, chases and danger, and had to be saved by Napoleon and Illya. That was Cary Grant as a Mad Man Ad Man in the Hitchcock film; on "UNCLE," the innocent could be a housewife, a salesman, a secretary, a pest control operator (William Shatner), etc.
"Get Smart": NBC commissioned this one to spoof "Man From UNCLE" (UNCLE vs. THRUSH became CONTROL vs. KAOS), and to combine James Bond with Inspector Clouseau. Mel Brooks and Buck Henry created the show, which began with lots of vaudeville slapstick, but as the years went on, the writers actually got more sophisticated, and so did "Get Smart," which had a very witty edge in its last seasons. The new movie will be hard-pressed to beat Ed Platt's slow-burning "Chief" under siege from the bumbling nasal-toned Maxwell Smart (Don Adams.) Platt had been a serious down-level character guy for many years, but "Get Smart" was his finest hour. All the comedy plays off of his dead-serious, long-suffering gravitas.
"The Wild Wild West": Westerns were huge on TV in the late fifties and early sixties, and this idea was perfect for the mid-sixties: James Bond meets Gunsmoke (with a touch of Jules Verne SciFi.) Short but hyper-macho Robert Conrad played perhaps the most muscular and thuggish of the superspies, James West, but he was "softened" by the casting of bookish mensch Ross Martin as Artemis Gordon, master of disguise. For school boys across the nation, "The Wild Wild West" postulated a fine fantasy: close friendship between a athletic jock and a brainy wit. (The movie blew this key to the show, with Will Smith's West hating Kevin Kline's supercilious Gordon for the entire movie, to the very last line: "Shut up, Gordon." Wrong.)
"The Avengers": The British entry in the spy craze (which may have even pre-dated the James Bond movies, I think) paired a derby-wearing, tweedy, pleasant-faced man named John Steed (always played by Patrick MacNee), with a succession of tough, beautiful women (first Honor "Pussy Galore" Blackman, then, much more famously, cool dominatrix Diana as Mrs. Emma Peel, then, finally, just some silly cute chick.) There was delightful sexual tension to MacNee's middle-aged-seeming Steed's match with the sexy widow "Mrs. Steed", and just as "I Spy" had a black hero and "UNCLE" had a Russian one, here was a show where the woman could kick ass just as well (no, better than) the man.
The spy show craze died out in the 60's; only James Bond himself really carried on the tradition, and he became quaint (before his "Bourne" reboot.) Our modern ones like "Alias" and "24" are far more heavy and grim than the 60's fantasy spy romps. The times have changed.
A toast to the witty and glamourous "buddy pairs" of the 60's spy shows, from another time and place.
P.S. We've gotten really bad movies out of all the TV spy shows ever made, less "The Man From UNCLE" and with "Get Smart" about to reveal itself. These shows were too distinctive unto their era to transfer to today. And their stars WERE stars. Uma Thurman was no Diana Rigg.