The Lone Ranger drops both revolvers in the quicksand when ordered to do so by Black Hawk. At the end of the show, the dropped revolvers are back in his holsters. At no time does the Lone Ranger retrieve the guns from the quicksand.
After Tonto is released from jail, he leaves town in a wagon with his horse lashed to the rear. There is no explanation as to where the wagon came from, nor why Tonto now is using it.
After the Lone Ranger rescues himself from the quicksand, he is covered in mud, but after a short chase of Vance Kiley, his clothes are dry and relatively clean.
The "island in the quicksand" should have been easily accessible from the slow-moving river behind it.