Contradiction with Exodus 4:10
Moses claimed he was slow of speech and tongue, while 2 Samuel 9:13 mentions Mephibosheth being lame but does not refer to any speech difficulties.
Exodus 4:10: And Moses said unto the LORD, O my Lord, I [am] not eloquent, neither heretofore, nor since thou hast spoken unto thy servant: but I [am] slow of speech, and of a slow tongue. [eloquent: Heb. a man of words] [heretofore: Heb. since yesterday, nor since the third day]
Contradiction with John 9:3
Jesus says a man's blindness was not due to sin, while 2 Samuel 9:13 mentions Mephibosheth's lameness without attributing it to sin.
John 9:3: Jesus answered, Neither hath this man sinned, nor his parents: but that the works of God should be made manifest in him.
Contradiction with Acts 3:8
A lame man is healed and walks, unlike Mephibosheth in 2 Samuel 9:13, who remained lame.
Acts 3:8: And he leaping up stood, and walked, and entered with them into the temple, walking, and leaping, and praising God.
Contradiction with Isaiah 35:6
The prophecy states that the lame will leap, contrasting with Mephibosheth’s continuous condition as lame in 2 Samuel 9:13.
Isaiah 35:6: Then shall the lame [man] leap as an hart, and the tongue of the dumb sing: for in the wilderness shall waters break out, and streams in the desert.