Contradiction with 2 Chronicles 35:25
This mentions lamentations made for Josiah, contrasting with the celebration of Passover in 2 Chronicles 35:19.
2 Chronicles 35:25: And Jeremiah lamented for Josiah: and all the singing men and the singing women spake of Josiah in their lamentations to this day, and made them an ordinance in Israel: and, behold, they [are] written in the lamentations.
Contradiction with 2 Chronicles 36:2
Jehoahaz's reign shortly after Josiah contradicts the continuity implied in 2 Chronicles 35:19 with the Passover observance.
2 Chronicles 36:2: Jehoahaz [was] twenty and three years old when he began to reign, and he reigned three months in Jerusalem.
Contradiction with 2 Kings 23:28
The good acts of Josiah, including Passover, seem contradictory if he is then killed in battle, as suggested elsewhere.
2 Kings 23:28: Now the rest of the acts of Josiah, and all that he did, [are] they not written in the book of the chronicles of the kings of Judah?
Contradiction with 2 Chronicles 34:28
A prophecy of Josiah's peaceful death seems to contradict his death after the events of the Passover celebration.
2 Chronicles 34:28: Behold, I will gather thee to thy fathers, and thou shalt be gathered to thy grave in peace, neither shall thine eyes see all the evil that I will bring upon this place, and upon the inhabitants of the same. So they brought the king word again.
Contradiction with 2 Chronicles 35:21
This account of Pharaoh Necho confronting Josiah suggests Josiah's vulnerability, unlike the victorious Passover described in 2 Chronicles 35:19.
2 Chronicles 35:21: But he sent ambassadors to him, saying, What have I to do with thee, thou king of Judah? [I come] not against thee this day, but against the house wherewith I have war: for God commanded me to make haste: forbear thee from [meddling with] God, who [is] with me, that he destroy thee not. [the house...: Heb. the house of my war]