Contradiction with Exodus 12:6
Deuteronomy 16:6 specifies sacrificing the Passover only at the designated place chosen by God, while Exodus 12:6 allows each household to sacrifice the lamb.
Exodus 12:6: And ye shall keep it up until the fourteenth day of the same month: and the whole assembly of the congregation of Israel shall kill it in the evening. [in...: Heb. between the two evenings]
Contradiction with Numbers 9:2
Deuteronomy 16:6 emphasizes the specific location for sacrifices, but Numbers 9:2 permits the Passover to be kept wherever the Israelites are camped.
Numbers 9:2: Let the children of Israel also keep the passover at his appointed season.
Contradiction with 2 Chronicles 30:2-3
Deuteronomy 16:6 requires the Passover to be observed at a specific time, yet 2 Chronicles 30:2-3 describes a situation where Hezekiah observed it in the second month instead of the first due to unforeseen circumstances.
2 Chronicles 30:2-3: For the king had taken counsel, and his princes, and all the congregation in Jerusalem, to keep the passover in the second month.