Anyone who's ever spent moving day at his new home can sympathize with actor Robert Duvall, who is moving into a 60-acre Middleburg, Va., farm known as Butcher's Run. All the clutter must have been too much for him. At 3 a.m. yesterday, he checked into the Red Fox Inn for a more orderly, restful night . . .

Enzo de Chiara, once owner of the now defunct "Romeo and Juliet" restaurant on K Street, is now special adviser on Italian affairs to the Republican National Committee . . .

There's probably a logical reason for it, but after Orioles owner Edward Bennett Williams and baseball legend Joe DiMaggio had lunch at Joe & Mo's yesterday and walked outside to the waiting limo, DiMaggio climbed into the back and Williams sat in front next to the driver . . .

George C. Scott may have been indifferent to his Oscar for "Patton," but he has finally agreed to play Gen. George S. Patton again. He will star in "The Last Days of Patton," a three-hour CBS television movie now in production in England and costarring Eva Marie Saint as Patton's wife . . .

Princess Diana, who, it seems, has always been part of the British royal family, celebrated her 24th birthday yesterday in her Highgrove country home in Gloucestershire and, for a change, everyone was home. But the quiet birthday wasn't without some consternation in the British press. She apparently accepted a gold and diamond ring from French jeweler Louis Gerard, breaking royal protocol about gifts to the royals from commercial organizations. The royals do have such perplexing problems . . .