 In the funeral scene, the dog consistently refused to look into the  grave. Finally, director George Stevens (I) (qv) had the dogs  trainer lie down in the bottom of the grave, and the dog played his  part ably. The coffin (loaded with rocks for appropriate effect) was  then lowered into the grave, but when the harmonica player began to  play "Taps" spontaneously, the crew was so moved by the scene that  they began shoveling dirt into the grave before remembering the  dogs trainer was still there.