Contradiction with Psalm 104:26
Suggests that Leviathan is not feared and can frolic in the sea, unlike in Job 41:2 where capturing it is depicted as impossible or dangerous.
Psalm 104:26: There go the ships: [there is] that leviathan, [whom] thou hast made to play therein. [made: Heb. formed]
Contradiction with Isaiah 27:1
Speaks of Leviathan being punishable and destroyed by the Lord, contrasting Job 41:2's portrayal of Leviathan’s untouchability.
Isaiah 27:1: In that day the LORD with his sore and great and strong sword shall punish leviathan the piercing serpent, even leviathan that crooked serpent; and he shall slay the dragon that [is] in the sea. [piercing: or, crossing like a bar]