Thirty thousand chariots - Probably a copyist’s mistake for 300. (Compare, for a similar numerical variation, 1 Chronicles 18:4 with 2 Samuel 8:4.)
Eastward from Bethaven - Or more simply “to the east of Bethaven,” which Joshua 7:2 lay “on the east side of Bethel.” Bethaven (thought to be the same as Deir Diwan) lay between Bethel and Michmash, which had been evacuated by Saul.