Originally, the scene in which Peggy peeks in on Hank as he watches the porno tapes was going to be longer and more graphic. In the original script, the pen Hank was taking notes with was to stop writing, so he would shake it up to get it to work again. However, this would have been at the moment Peggy was peeking in (from behind), so she would think he was masturbating. An animatic of this can be seen on the Season Two DVD.
In the episode, "Hank's Dirty Laundry," the Hill residence is shown as being located at 320 Rainey, Arlen, TX 78701. '78701' is really the default standard U.S. Postal Service zip code for Austin, Texas.