Help From Ranks Of'Extras'— Director Beams HOLLYWOOD—Several times Director Jean Renoir rehearsed his 200 movie extras dressed as nazi soldiers, still couldn't get them to goose-step to please him. Meanwhile, filming of a scene for R K O Radio's "This Land Is Mine," showing Charles Laughton and Maureen O'Hara on watch as the troops enter a town in conquered Europe, was held up. Suddenly, a little extra, weather-beaten, past 50, stepped out of the ranks, began barking orders in a voice like a file. Magically the ranks straightened up. Renoir beamed. Who was the extra? "Vance Divenney," said the latter. "Drill sergeant with the U. S. regulars back in 1917. And I hope you're not sore. I don't like the uniform any better than the rest, sir, but I hate sloppy soldiers worse." "I, too," said Renoir, happily. "Now we shoot the scene. But this time, you give the orders."