Contradiction with 1 Samuel 12:12
1 Samuel 12:12 highlights Israel's demand for a king to lead them, contradicting the loyalty and presence of foreign groups supporting David in 2 Samuel 15:18.
1 Samuel 12:12: And when ye saw that Nahash the king of the children of Ammon came against you, ye said unto me, Nay; but a king shall reign over us: when the LORD your God [was] your king.
Contradiction with 1 Samuel 15:35
Samuel's lifelong grief over Saul contradicts the notion of strong support for a king, as seen with David's followers in 2 Samuel 15:18.
1 Samuel 15:35: And Samuel came no more to see Saul until the day of his death: nevertheless Samuel mourned for Saul: and the LORD repented that he had made Saul king over Israel.
Contradiction with Deuteronomy 17:15
Deuteronomy 17:15 calls for an Israelite king, conflicting with the support of non-Israelites for David noted in 2 Samuel 15:18.
Deuteronomy 17:15: Thou shalt in any wise set [him] king over thee, whom the LORD thy God shall choose: [one] from among thy brethren shalt thou set king over thee: thou mayest not set a stranger over thee, which [is] not thy brother.
Contradiction with Judges 8:23
Gideon's refusal of kingship contradicts the acceptance of leadership seen with David in 2 Samuel 15:18.
Judges 8:23: And Gideon said unto them, I will not rule over you, neither shall my son rule over you: the LORD shall rule over you.
Contradiction with 1 Samuel 8:19-20
The Israelites' desire for a king contrasts with the voluntary support David receives from others in 2 Samuel 15:18.
1 Samuel 8:19-20: Nevertheless the people refused to obey the voice of Samuel; and they said, Nay; but we will have a king over us;