Contradiction with Jeremiah 52:15
Mentions the people being carried away by Nebuzaradan, possibly creating the impression of multiple deportations which could contradict the singularity or different aspects of the event in Jeremiah 39:9.
Jeremiah 52:15: Then Nebuzaradan the captain of the guard carried away captive [certain] of the poor of the people, and the residue of the people that remained in the city, and those that fell away, that fell to the king of Babylon, and the rest of the multitude.
Contradiction with 2 Kings 25:11
Indicates the same action as Jeremiah 39:9 but could suggest a differing timeframe or set of people being carried away, raising potential contradiction in accounts.
2 Kings 25:11: Now the rest of the people [that were] left in the city, and the fugitives that fell away to the king of Babylon, with the remnant of the multitude, did Nebuzaradan the captain of the guard carry away. [fugitives: Heb. fallen away]
Contradiction with Jeremiah 40:7
Shows some people remaining in the land, appearing to contradict with the idea that all were taken away in Jeremiah 39:9.
Jeremiah 40:7: Now when all the captains of the forces which [were] in the fields, [even] they and their men, heard that the king of Babylon had made Gedaliah the son of Ahikam governor in the land, and had committed unto him men, and women, and children, and of the poor of the land, of them that were not carried away captive to Babylon;
Contradiction with Jeremiah 43:5-7
Suggests that not all Jews were taken to Babylon as some went to Egypt, which contrasts with the idea that they were all taken to Babylon.
Jeremiah 43:5-7: But Johanan the son of Kareah, and all the captains of the forces, took all the remnant of Judah, that were returned from all nations, whither they had been driven, to dwell in the land of Judah;