Contradiction with John 1:18
This verse states that "No man hath seen God at any time," which contradicts Judges 13:21 where it is implied that the angel of the LORD (interpreted as a manifestation of God) was seen by Manoah and his wife.
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 Exodus 33:20
God tells Moses that no one can see His face and live, contradicting the encounter with the angel of the LORD being seen by Manoah and his wife in Judges 13:21, suggesting a divine appearance.
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
It describes God as dwelling in unapproachable light whom no man has seen or can see, contradicting the visible encounter in Judges 13:21.
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 Isaiah 6:5
Isaiah's reaction to seeing the Lord on his throne is one of doom, as Isaiah recognizes the gravity of seeing a holy God and living, which stands in contrast to the interaction without immediate consequence in Judges 13:21.
Isaiah 6:5: Then said I, Woe [is] me! for I am undone; because I [am] a man of unclean lips, and I dwell in the midst of a people of unclean lips: for mine eyes have seen the King, the LORD of hosts. [undone: Heb. cut off]