This may not be a new tip to most, but definitely new to me.
As I remove a plethora of "collections" from my walls (EVERY. WALL.) to pack, some of the gaping holes left behind have really bothered me, especially those from screws or larger nails that seem to pull the paint/drywall with its removal.
As I removed one stubborn screw in the bathroom, and looked at the hole it left behind that looked like a mini volcano with its lifted edges, I turned my screwdriver around and pushed on the hole with rounded end. Wala! No more mini volcano!
Probably a useless tip to most, but a tip all the same. Now I'm back to using the end of my screwdriver on the other thousand holes.