Contradiction with Joshua 12:1
Deuteronomy 4:47 states that Israel possessed the land east of Jordan, while Joshua 12:1 lists it among lands conquered but not yet possessed by Israel.
Joshua 12:1: Now these [are] the kings of the land, which the children of Israel smote, and possessed their land on the other side Jordan toward the rising of the sun, from the river Arnon unto mount Hermon, and all the plain on the east:
Contradiction with Deuteronomy 3:12
Deuteronomy 4:47 mentions Israel possessing the land whereas Deuteronomy 3:12 refers to Moses distributing the land to the tribes as a future event, not yet possessed.
Deuteronomy 3:12: And this land, [which] we possessed at that time, from Aroer, which [is] by the river Arnon, and half mount Gilead, and the cities thereof, gave I unto the Reubenites and to the Gadites.