Early in the film, when Minnie is sitting on the pillow, there are no feathers around it. Later, there are feathers around the pillow for Mickey to blow away as he passes Minnie and the pillow.
When Donald goes through the log into the water, he is wearing the remains of his sweater. When he rises to the surface and Goofy hits him with the bat, his sweater is gone. He is not seen taking it off.