Common Tranny Leak Spots?

Thanks guys, I will try to take a look around the dipstick and see if maybe the pan has gotten loosened up again. It seems to have a ding or two in the edges so that could be a problem, I may try to bang them out or get a new pan/gasket since I'm losing a quart of fluid every time I park for a few days anyways.

Just wanted to ask again, is Dexron/Mercon fluid OK, or should I be using ATF +4?