Contradiction with John 6:46
John 6:46 states that no man has seen the Father, whereas John 7:29 claims that Jesus knows Him.
John 6:46: Not that any man hath seen the Father, save he which is of God, he hath seen the Father.
Contradiction with Exodus 33:20
Exodus 33:20 states that no man can see God's face and live, while John 7:29 implies an intimate knowledge of God.
Exodus 33:20: And he said, Thou canst not see my face: for there shall no man see me, and live.
Contradiction with 1 Timothy 6:16
1 Timothy 6:16 mentions God dwelling in unapproachable light, whom no one has seen, contrasting with John 7:29's claim of knowing Him.
1 Timothy 6:16: Who only hath immortality, dwelling in the light which no man can approach unto; whom no man hath seen, nor can see: to whom [be] honour and power everlasting. Amen.
Contradiction with 1 John 4:12
1 John 4:12 claims that no one has seen God at any time, which seems to conflict with the intimate knowledge mentioned in John 7:29.
1 John 4:12: No man hath seen God at any time. If we love one another, God dwelleth in us, and his love is perfected in us.