Contradiction with 1 Kings 6:20
Contradicts Exodus 37:6 in dimensions of the Mercy Seat compared to the Holy of Holies care dimensions.
1 Kings 6:20: And the oracle in the forepart [was] twenty cubits in length, and twenty cubits in breadth, and twenty cubits in the height thereof: and he overlaid it with pure gold; and [so] covered the altar [which was of] cedar. [pure: Heb. shut up]
Contradiction with Hebrews 9:4
Provides different content inside the Ark compared to the context of Exodus 37:6, which focuses on construction.
Hebrews 9:4: Which had the golden censer, and the ark of the covenant overlaid round about with gold, wherein [was] the golden pot that had manna, and Aaron's rod that budded, and the tables of the covenant;
Contradiction with Exodus 20:4
Contradicts the commandment against making graven images while Exodus 37:6 describes making of the Mercy Seat with cherubim.
Exodus 20:4: Thou shalt not make unto thee any graven image, or any likeness [of any thing] that [is] in heaven above, or that [is] in the earth beneath, or that [is] in the water under the earth: