From what I've heard...no. You don't give an email or phone or anything, and quite frankly, it's too much work for some med schools to download your entire app, do you think they're going to search for your contacts? However, if you volunteered at University of Mozambique for 2 years and put Dr. Hotstuff as your contact, and now you're applying to U of Mozambique and some prof on the adcom knows Dr. Hotstuff he might just ask him about you. Or you apply to a completely different institution but your interviewer went to med school with one of your contacts so he gives him a call. Sounds far-fetched but it's a small world! Bottom line - don't worry about it but don't lie on your app.