In the first season of the show the guy that Jenn got sent to Capeside because of is named Billy, when a few seasons later the story changes that to Drue Valentine when he comes to Capeside.
Throughout the series, it's clear that the actors/actresses portraying teenagers are actually in their 20s+. This is usually done to get around child labor laws, that won't allow teenagers to work full time on a set due to interfering with their real-life schooling. Plus casting adults adds to the benefit of better acting from the actors/actresses due to having more experience plus the producers are able to sexualize the characters without consequences. Lastly, it gives the general viewing audience who are teenagers (or young people) someone they can look up to.
Mic packs being worn by the actors are occasionally visible.
The first season took place from fall to spring in the state of Massachusetts, however the realities of a Massachusetts winter (snow, heavy clothes, etc.) never appeared.