Contradiction with Mark 11:30
The question posed to the chief priests and scribes about the baptism of John reflects authority and insight that contrasts with the disciples' need for clarification in recognizing Jesus' identity in Mark 8:27.
Mark 11:30: The baptism of John, was [it] from heaven, or of men? answer me.
Contradiction with John 10:33
The Jews' understanding of Jesus' identity as blasphemous for claiming to be God contradicts the recognition of Jesus as the Messiah in Mark 8:27.
John 10:33: The Jews answered him, saying, For a good work we stone thee not; but for blasphemy; and because that thou, being a man, makest thyself God.
Contradiction with Luke 9:20
Peter's clear recognition of Jesus as "The Christ of God" contrasts with the implied uncertainty or need for identification in Mark 8:27.
Luke 9:20: He said unto them, But whom say ye that I am? Peter answering said, The Christ of God.