Contradiction with Matthew 16:22
This verse contradicts Mark 8:32 as Peter rebukes Jesus in both, yet Jesus' reaction in each account differs.
Matthew 16:22: Then Peter took him, and began to rebuke him, saying, Be it far from thee, Lord: this shall not be unto thee. [Be...: Gr. Pity thyself]
Contradiction with Matthew 16:23
Jesus rebukes Peter, calling him Satan, which is a contradiction of Peter's intention to protect Jesus mentioned in Mark 8:32.
Matthew 16:23: But he turned, and said unto Peter, Get thee behind me, Satan: thou art an offence unto me: for thou savourest not the things that be of God, but those that be of men.
Contradiction with Luke 9:22
Jesus speaks of His suffering and death, contradicting the disbelief and rebuke by Peter noted in Mark 8:32.
Luke 9:22: Saying, The Son of man must suffer many things, and be rejected of the elders and chief priests and scribes, and be slain, and be raised the third day.