I think I just heard the difference between commercial and noncommercial radio in a nutshell: If a DJ on a commercial station almost played the wrong song, (s)he likely wouldn't mention it. On a noncommercial station, however, a DJ is more likely to say, as I just heard, "Oops...The wrong track was about to play, and I'm not about to let that happen."
The DJ didn't have to acknowledge that, but I found it refreshing that she did. In doing so, she admitted on-air how helter-skelter and down-to-the-wire some aspects of free form radio are.
