I'm going to sound an emphatic "NO" on this issue. If you have notes that you're trying to look at, even if the interviewer allows it, you're going to look (and be) scripted. Part of what they're looking for is how you operate on your feet. A portfolio is a classy folder in which you bring a copy of your application (AMCAS and 2ndary). If they ask you very specific information (like a grade or a date) you can look in there. But I implore you, DO NOT have a crib sheet. Just go in and have a conversation. Think about points that you want to make before hand, but don't even memorize them. Let the conversation roll. When things come up... talk about what interested you... have examples... just talk to them. Nothing would turn me off an applicant more than if they were reading off of notes. Given, I'm not on an ADCOM so what I think doesn't really matter, but that's my two cents.
-dope-