We didn't have digital cameras in my day, or camera phones. But I would take "before" pictures, and try to get everything exactly the way it was left, you can never be too precise if you want to pull it off.
Narc neighbors, and a bunch of cars up and down your street are something to watch out for and can draw attention of loud mouth neighbors being like "Hey Bill! Your son had quite the party last weekend" when they come back.
Watch for drunk chicks spilling cac too.
Search under couches, chairs, nooks and crannies for lighters, weed, bottlecaps, condoms, or whatever before they come back.
Fabreeze entire house too. And leave yourself plenty of "prep" time before they come back. Most mistakes are made by rushed/hungover/"day of parents arrival" haphazard cleanup.