WHAT IT'S ABOUT Veteran producer John Scheinfeld ("Dick Cavett's Vietnam," "Dick Cavett's Watergate") has assembled a lot of footage and some big stars — Julie Andrews, Carol Burnett, Jim Carrey, Ted Danson, Steve Martin, Conan O’Brien, Martin Short — for a particularly detailed "American Masters" look at one of the incandescent careers of television history. (Interviews of the subject do however appear to be about 20 years old — but they're still informative.)

MY SAY God and body willing, Dick Van Dyke will turn 100 on Saturday. He's said he'll celebrate quietly at home, watching a "Jeopardy!" marathon. No parties, no parades, no key handed over from whatever mayor in whatever city he's living in at the moment — just Dick and his TV set and Ken Jennings. Presumably that extended, intro

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