VIDEOCASSETTES

“Muppet Moments.� Playhouse. $59.98. Before Kermit, Miss Piggy and the rest of the rag-tag Muppets got swelled heads and abandoned TV for careers on the Big Screen, they were--for five frisky years (1976-81)--the toast of family entertainment. Now, for nostalgic teens and a new generation of toddlers, comes a series of 10 one-hour “best of� cassettes, this one hosted by Kermit and Fozzie Bear and featuring appearances by such humankind as Liza Minnelli, Zero Mostel and Lena Horne.

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