Contradiction with 1 Samuel 9:20
Contradicts by indicating that Saul's father's donkeys were already found before Saul's anointing, while 1 Samuel 10:2 suggests otherwise.
1 Samuel 9:20: And as for thine asses that were lost three days ago, set not thy mind on them; for they are found. And on whom [is] all the desire of Israel? [Is it] not on thee, and on all thy father's house? [three...: Heb. to day three days]
Contradiction with Genesis 41:16
Contradicts by showing Joseph giving credit to God for knowledge, whereas 1 Samuel 10:2 demonstrates Samuel's confident assertion of foreknowledge.
Genesis 41:16: And Joseph answered Pharaoh, saying, [It is] not in me: God shall give Pharaoh an answer of peace.