It's not always the obvious things that make a wedding less than great. In fact, it's the small (but very crucial) missed details and not planning for the unexpected that can ruin the big day. When we think about past weddings we've attended that could've been improved, it's not the place settings or the centerpieces that we wish were nicer — it's simple things like parking and seating. So, before you freak out over the decor, consider aspects that your guests would most appreciate or not appreciate. Here are 13 of the worst wedding faux pas to avoid.