The Addams Family was especially nice because it was the last performance for some of the cast members. Those are always special shows, particularly if they're comedies because the cast will inevitably work in a mention (in character) and really kick up the performance. Nathan Lane clearly ad-libbed a few lines to break up the cast and the change of actors was mentioned off-handed in one of the scenes.

After the final curtain, the cast came out with the crew, writers, & director and they spent about 30 minutes saying their goodbyes. Those are emotional moments for the cast and certainly a very rare experience for the audience. We had no idea that would be the case. We purchased our tickets a few months ago and only knew because Nathan Lane mentioned it on Conan a couple of weeks ago.