Contradiction with Exodus 9:6
Exodus 9:6 states that all the livestock of Egypt died, but Exodus 9:33 implies there were livestock left.
Exodus 9:6: And the LORD did that thing on the morrow, and all the cattle of Egypt died: but of the cattle of the children of Israel died not one.
Contradiction with Exodus 10:3-4
Pharaoh's resistance to the warnings despite witnessing cessation of hail upon Moses' request contradicts the expected repentance.
Exodus 10:3-4: And Moses and Aaron came in unto Pharaoh, and said unto him, Thus saith the LORD God of the Hebrews, How long wilt thou refuse to humble thyself before me? let my people go, that they may serve me.
Contradiction with Exodus 8:31
As in Exodus 9:33, Moses prays, and God acts, but Pharaoh's hardened heart contradicts expected submission.
Exodus 8:31: And the LORD did according to the word of Moses; and he removed the swarms [of flies] from Pharaoh, from his servants, and from his people; there remained not one.
Contradiction with Exodus 14:5
Despite witnessing acts like the cessation of plagues, Pharaoh's heart is hardened again against commonsensical retreat.
Exodus 14:5: And it was told the king of Egypt that the people fled: and the heart of Pharaoh and of his servants was turned against the people, and they said, Why have we done this, that we have let Israel go from serving us?