Contradiction with 1 Samuel 15:11
The LORD regretted making Saul king over Israel, which contrasts with the support Saul initially had and highlights a divine change in support away from Saul.
1 Samuel 15:11: It repenteth me that I have set up Saul [to be] king: for he is turned back from following me, and hath not performed my commandments. And it grieved Samuel; and he cried unto the LORD all night.
Contradiction with 1 Samuel 8:7-9
God tells Samuel that the people have rejected Him as king by asking for a human king, which lays the foundation for the challenges and transitions in kingship seen in 1 Chronicles 12:23.
1 Samuel 8:7-9: And the LORD said unto Samuel, Hearken unto the voice of the people in all that they say unto thee: for they have not rejected thee, but they have rejected me, that I should not reign over them.
Contradiction with Hosea 13:11
God expresses regret over giving Israel a king in His anger, contrasting with the organized transfer of power to David.
Hosea 13:11: I gave thee a king in mine anger, and took [him] away in my wrath.
Contradiction with Judges 21:25
"Every man did that which was right in his own eyes" reflects a time of disunity, opposed to the organized military support for David mentioned in 1 Chronicles 12:23.
Judges 21:25: In those days [there was] no king in Israel: every man did [that which was] right in his own eyes.
Contradiction with 1 Samuel 10:19
The Israelites are accused of rejecting God as their king by asking for a mortal king, which contrasts with 1 Chronicles 12:23 as it celebrates the unification of support for David’s kingship.
1 Samuel 10:19: And ye have this day rejected your God, who himself saved you out of all your adversities and your tribulations; and ye have said unto him, [Nay], but set a king over us. Now therefore present yourselves before the LORD by your tribes, and by your thousands.