It's The Wolf

When Bristle Hound grabs Mildew from the lady who thinks that he isn't alive, he doesn't have his clothes on but when Bristle starts swinging him around, Mildew's clothes mysteriously appear then disappear the next scene.

Lambsy's scout hat disappears in the scene where Mildew arrives in a car and then reappears in the close-up of Lambsy.