Probably they do, and they would more than likely clear the rights before a commercial run. Assuming those involved with the movie had a sense of humor, it would hopefully become a non issue.
And as for restaging it, I found moments like the chalk board erasers to be part of the show's charm.
Nothing precious, plain to see, don't make a fuss over me. Not loud, not soft, but somewhere inbetween. Say sorry, just let it be the word you mean.