Contradiction with Genesis 36:39
This verse states: "And Baalhanan the son of Achbor died, and Hadar reigned in his stead: and the name of his city was Pau; and his wife's name was Mehetabel, the daughter of Matred, the daughter of Mezahab." This contradicts 1 Chronicles 1:45 which mentions Hadad instead of Hadar as the successor to Baalhanan.
Genesis 36:39: And Baalhanan the son of Achbor died, and Hadar reigned in his stead: and the name of his city [was] Pau; and his wife's name [was] Mehetabel, the daughter of Matred, the daughter of Mezahab. [Hadar, Pau: or, Hadad, Pai: after his death was an Aristocracy]