Would include whatever you realistically want to potentially talk about in an interview. For example, don't mention the summer of basic biology research from college if you can't talk intelligently about it if asked about it.
Another way of thinking about it is that you should list things that fit with whatever story you're trying to tell. If research is a major part of your application, then it's fair game to list your college projects to show that this is something you've been invested in for years. If volunteering/advocacy is big part of your story, then listing meaningful leadership positions from college might make sense to again show your commitment. But if something wasn't truly significant or if there isn't a way to show that it contributed to what you did in med school, it may not be worth listing--if you list every little insignificant fluff that was on your AMCAS application, you may wind up making it hard to tell which experiences were actually meaningful, and thus what people should actually ask you about in an interview.
