Contradiction with Exodus 3:6
Moses hid his face because he was afraid to look at God, whereas in Exodus 34:31, he is confident and unafraid while speaking to others about God's message.
Exodus 3:6: Moreover he said, I [am] the God of thy father, the God of Abraham, the God of Isaac, and the God of Jacob. And Moses hid his face; for he was afraid to look upon God.
Contradiction with John 1:18
States that no one has seen God at any time, yet in Exodus 34, Moses speaks directly with God.
John 1:18: No man hath seen God at any time; the only begotten Son, which is in the bosom of the Father, he hath declared [him].
Contradiction with 1 Timothy 6:16
Describes God as dwelling in unapproachable light whom no one has seen or can see, which contrasts with the direct interaction Moses has in Exodus 34:31.
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
Reiterates that no one has seen God, which appears to conflict with Moses' experiences described in Exodus 34.
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.