Contradiction with John 7:52
They argue that no prophet arises out of Galilee, contradicting John's emergence in the wilderness of Judea.
John 7:52: They answered and said unto him, Art thou also of Galilee? Search, and look: for out of Galilee ariseth no prophet.
Contradiction with 1 Samuel 9:9
In those times, prophets were called seers, but in Matthew 3:1, John is presented merely as a preacher.
1 Samuel 9:9: (Beforetime in Israel, when a man went to enquire of God, thus he spake, Come, and let us go to the seer: for [he that is] now [called] a Prophet was beforetime called a Seer.)
Contradiction with John 19:9-11
This passage implies Jesus comes from a different area (Nazareth) than where John is preaching (Judea), which could contradict regional prophetic significance.
John 19:9-11: And went again into the judgment hall, and saith unto Jesus, Whence art thou? But Jesus gave him no answer.
Contradiction with Luke 1:80
John is said to be in the deserts until his showing to Israel, differing from being prominently in Judea beforehand as implied in Matthew 3:1.
Luke 1:80: And the child grew, and waxed strong in spirit, and was in the deserts till the day of his shewing unto Israel.