The NBC-TV geniuses, having publicized in advance that they were wiring Arkansas Coach Lou Holtz for sound on the sidelines, went one step beyond at the Fiesta Bowl yesterday and got more than they bargained for.

Broadcaster Mike Haffner was along the UCLA side at Tempe and upon a Bruin interception, straight-away approached Coach Terry Donahue (his old college roomie) to hear what play he would see in. As Haffner pointed his microphone toward Donahue, the officials nullified the interception-penalty on UCLA.

Too bad the network couldn't call back the two-word expletive uttered by Donahue just as the mike arrived.

Up in the booth, quick-on-the-uptake John Brodie remarked to the multitudes. "That first play sounds like a lulu." Back in NBC's New York studios, a network brassie gulped, "That's why we miked Lou Holtz. He's the kind of person who wouldn't say that."

Emory Harman of the Maryland Fastbreakers says we shortchanged Relph Sampson, Harrisonburg (Va.) High's basketball phenom, in calling him 7-foot-2: Harrisonburg's program lists Sampson at 7-3 3/4 . . . Must have been some sight the other day in the Asian Games basketball final, when during China's 91-71 conquest of South Korea, 7-foot-5, 308-pound Chinese center Mu Tieh-chu became angry. Mu got hit in the eye and fouled by Park Soo-Kyu and, infuriated, gave chase as Park ducked under the Korean bench. The pro-Chinese spectators in Bangkok began tossing ice cubes, shoes and whatnot at the Koreans and it took 50 police wielding riot sticks to restore order. Mu and company, remember, beat the Georgetown Hoyas in friendly fashion last month in D.C. Armory . . . U. of Virginia hoopsters ought to come out fresh for this week's Sugar Bowl tournament following a leisurely stretch of exhibition action, sun and surf in the Bahamas.