Honestly, you'll probably get better quality work if you leave them alone. Make sure they understand what you want, and take a look at it before they pack up to address any issues.
I've walked outside, packed up tools, and drove away before. I simply tell my office they can fuck right off. If they want to hire a professional then tell them how "that can't be right because they did this on the TV show..." They can call the TV show. I didn't spend the last 15 years being an electrician so that Suzie homemaker could lecture me on how wrong it is that I'm doing stuff she doesn't like to meet code.
On a side note, we did a weekend bath remodel that was on TV. It took them 6 months, and they made sure we showed up with the same shirt and pants every day we worked there so they could lie about the time frame. The cameras slowed shit down big time.