Definitely Schwump. Holding up the wall.
Now what's his real name?????
One thing that comes to mind is to check through all the “uncredited” male actors listed on IMDB for this movie. I started to do this, but might give it a more serious attempt. We could then answer the question for all time “Who is Mr. Schwump?”
Great catch Keevy. I have searched and searched through uncredited cast credits and still the mystery lingers.
I found the Real Ron Howard Facebook page and posted this question. The post is being reviewed. If anyone could answer this mystery, he could.