Contradiction with 1 Samuel 19:1
Saul directly expressed his intention to kill David, which contradicts Jonathan's belief in 1 Samuel 20:2 that Saul would not act without informing him.
1 Samuel 19:1: And Saul spake to Jonathan his son, and to all his servants, that they should kill David.
Contradiction with 1 Samuel 18:11
Saul had previously attempted to kill David with a spear, contradicting Jonathan's assertion that Saul would have revealed his hostile intentions.
1 Samuel 18:11: And Saul cast the javelin; for he said, I will smite David even to the wall [with it]. And David avoided out of his presence twice.
Contradiction with 1 Samuel 22:17-18
Saul ordered the killing of the priests of Nob, showing a pattern of unpredictable violence, contrary to Jonathan's belief in Saul's transparency of intentions.
1 Samuel 22:17-18: And the king said unto the footmen that stood about him, Turn, and slay the priests of the LORD; because their hand also [is] with David, and because they knew when he fled, and did not shew it to me. But the servants of the king would not put forth their hand to fall upon the priests of the LORD. [footmen: or, guard: Heb. runners]
Contradiction with 1 Samuel 23:15-16
David continually fled from Saul’s pursuit, contradicting Jonathan's perception that no real threat existed.
1 Samuel 23:15-16: And David saw that Saul was come out to seek his life: and David [was] in the wilderness of Ziph in a wood.
Contradiction with 1 Samuel 24:2
Saul actively sought David to kill him, opposing Jonathan's assurance of no harm intended against David.
1 Samuel 24:2: Then Saul took three thousand chosen men out of all Israel, and went to seek David and his men upon the rocks of the wild goats.