"People come along and impose their own stuff on plays, and it shows"

This quote by Judd Hirsch is referring to the imaginative process of theater. He is suggesting that when people can be found in and try to enforce their own concepts and interpretations on a play, it can be seen in the end product. He is suggesting that when someone attempts to require their own concepts onto a play, it can be seen in the performance and can be damaging to the general quality of the production. He is recommending that it is necessary to appreciate the original intent of the playwright and to not attempt to enforce one's own ideas onto the play. He is also recommending that it is important to be available to new ideas and interpretations, however to not let them take away from the original intent of the play.