1) The lunar surface is covered in soil (proper term: regolith) formed from the ejecta of several billion years of meteor impacts. When Apollo landed on the moon, the tv images showed dust streaking away from the landing site driven by the exhaust from the rocket.
2) Videos of the space buggy show it bouncing across the surface. No doubt leaving gaps in its tracks.
3) When the buggy was first driven it threw up a roster tail of dust some of which landed on on the buggy. They stopped and repaired the damaged fender with grey tape and a map sheet.
4) The guy with the hammer is Jack Harrison-Schmit, the only scientist (geologist) to go to the moon in what was supposed to be a program of scientific exploration. Even then he only got a ride on the last trip.
5) There were multiple moon landings. As I've said Apollo 17 was the last.