Contradiction with John 14:7
John 14:7 states that if you had known Jesus, you would have known the Father also, indicating awareness of the connection between Jesus and the Father, in contrast to John 8:27 where they did not understand that Jesus was speaking of the Father.
John 14:7: If ye had known me, ye should have known my Father also: and from henceforth ye know him, and have seen him.
Contradiction with John 10:30
John 10:30 claims that Jesus and the Father are one, suggesting a clear and direct relationship, contradicting John 8:27 where the audience did not grasp that Jesus referred to the Father.
John 10:30: I and [my] Father are one.
Contradiction with John 1:18
John 1:18 reveals that no one has seen God but the only begotten Son has declared Him, contrasting John 8:27 where there's a lack of understanding of the divine revelation Jesus provides.
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 John 16:3
John 16:3 notes that those who do not know Jesus or the Father remains in ignorance, aligning with the misunderstanding in John 8:27 but contradicting the implied revelation of the Father through Jesus in later texts.
John 16:3: And these things will they do unto you, because they have not known the Father, nor me.