Actually, he means the issues themselves change. The most recognizable is the issue of People, which changes from having Soleil Moon Frye on the cover to having Brandon Lee on the cover. My theory is the new issue of People came in that day, we just didn't see the scene.
Well, the thing is this movie was shot in the store that Kevin Smith actually worked in, made on a 28,000 dollar budget. He actually had to sell his comic book collection to get it finished. I don't think he was too worried about little things like the magazines changing. He was most concerned about finishing the movie, not piddly little mistakes that you guys are picking up on. Also, this movie was shot while he was on duty, working, he couldn't very well switch all the magazine covers back to what they were when they started shooting, he'd get fired, and have no place to shoot the movie.
Actually, the movie was not shot while the store was open. It was shot in the hours when the store was closed, hence the small amount of shots with daylight.
"I don't think he was too worried about little things like the magazines changing. He was most concerned about finishing the movie, not piddly little mistakes that you guys are picking up on."
I've seen loads of comments like this, all over this site. What you fail to grasp is that this is a site for SLIP-UPS. The magazines change, which constitutes a slip-up in my book, and obviously to the people who maintain this site, since they've seen fit to include it. If you're not happy with people posting such comments, don't come here.