Anne of Green Gables   Keep it simple. Don't attempt to overcreate each setting. Concentrate on costumes to give the feel. Make transitions quick and subtle.   Jim D'Attilio, Walpole High School, Walpole, Mass.   Order breakaway slates to be used for the slate broken over Gilbert's head. "Amazing Grace" works better for a funeral song.   Drama Director, Byng Public School, Ada, Okla.   Double/triple cast characters to cut down on cast size and to give some actors a chance to appear on stage in more than one scene.   Anji Straayer, Grand Rapids Baptist High School, Grand Rapids, Mich.   I would suggest casting as many kids as possible. There are some parts that have very few lines, but there are some lines not assigned in the script to give out.   Bob Howell, Illinois Valley Central High School, Chillicothe, Ill.