Ex-KGB agent David McCallum brainwashes ex-CIA agent Robert Vaughn and gets him to "Say Uncle!" That's the title of the "A-Team" episode now shooting with the buddy stars of the old "Man From U.N.C.L.E." "A-Team" producer John Ashley said McCallum was cast opposite Vaughn, a new series regular, because of the hefty ratings of the recent "Return of 'Man From U.N.C.L.E.' " . . . Bruce Dern plays the mentor of some young Chicago dice-throwers (Matt Dillon is one) in the '50s in the film drama "The Arm," now shooting in Chicago. . . . Nick Nolte will do the De Laurentiis film "Weeds." Nolte plays a convict who gets paroled and takes a play he's written on the road with fellow inmates. . . . Hired assassin Philip Anglin will stalk Burt Reynolds in "Malone," now shooting in Vancouver. . . . Kenny Rogers Jr. will make his acting debut as a punk rock musician in the syndicated TV series "THROB." He'll also sing one of his original songs.