By Ken Tucker
Updated December 23, 1994 at 05:00 AM EST

It’s tricky, these days, to be nostalgic without tipping over into campiness, especially if Marie Osmond is around, but Television’s Christmas Classics manages to be warmly comforting without inspiring too many cold snickers. This special gathers yuletide clips from TV history to celebrate Christmas, from a slew of Muppets bellowing their way through ”Deck the Halls,” to Bing Crosby and David Bowie harmonizing, in an affably wobbly way, on ”The Little Drummer Boy.” Osmond is an unobtrusive guide to these snippets, which also include holiday scenes from series as varied as The Honeymooners, Barney Miller, and St. Elsewhere. The standout in this area is a set piece from a 1960 Jack Benny Show, in which Benny buys a wallet from an exasperated salesman played by Mel Blanc, best known as the voice of Bugs Bunny, Daffy Duck, and many other cartoon characters. The scene reminds you of how subtle Benny was, and what an unsung comic actor Blanc was. B