That's an interesting idea! I wouldn't be surprised if we saw that tape again. Rob Thomas said in one of his interviews a while ago that he would want season one events to serve as both clues and/or red herrings for season two mysteries. I don't think that's spoilery - We have no idea what the season two mysteries will be, but I would be surprised if they're not related to season one, at least peripherally.

I, too, think it's strange that Lilly would use the term "good secret" about Aaron with Veronica. Who knows, though? I also read her delivery a little bit as it's a "big one" more than a positive one. But I cannot imagine her ever telling Veronica about Aaron. Because, just yuck.