Contradiction with Genesis 11:6
While Nehemiah 11:6 emphasizes unity and specific numbers, Genesis 11:6 talks about the disruption of unity through the diversity of languages.
Genesis 11:6: And the LORD said, Behold, the people [is] one, and they have all one language; and this they begin to do: and now nothing will be restrained from them, which they have imagined to do.
Contradiction with Judges 7:3
Nehemiah 11:6 acknowledges a specific number of valiant men, whereas Judges 7:3 shows that fear can lead to a reduction in the expected number of warriors.
Judges 7:3: Now therefore go to, proclaim in the ears of the people, saying, Whosoever [is] fearful and afraid, let him return and depart early from mount Gilead. And there returned of the people twenty and two thousand; and there remained ten thousand.