Contradiction with Mark 14:30
Jesus tells Peter that he will deny Him three times, contrasting with John's detailed description of denials.
Mark 14:30: And Jesus saith unto him, Verily I say unto thee, That this day, [even] in this night, before the cock crow twice, thou shalt deny me thrice.
Contradiction with Mark 14:72
Peter weeps after the third denial, contrasting the account of Peter's denials by the fire in John's description.
Mark 14:72: And the second time the cock crew. And Peter called to mind the word that Jesus said unto him, Before the cock crow twice, thou shalt deny me thrice. And when he thought thereon, he wept. [when...: or, he wept abundantly, or, he began to weep]
Contradiction with Luke 22:61
Peter's reaction to Jesus' look after his denial contrasts with the absence of such an interaction in John's account.
Luke 22:61: And the Lord turned, and looked upon Peter. And Peter remembered the word of the Lord, how he had said unto him, Before the cock crow, thou shalt deny me thrice.
Contradiction with Matthew 26:74
Peter's swearing during his denial contrasts with John's account of a straightforward denial.
Matthew 26:74: And Peter remembered the word of Jesus, which said unto him, Before the cock crow, thou shalt deny me thrice. And he went out, and wept bitterly.
Contradiction with Luke 22:59
The timing of the denials in Luke's account contrasts with the time references in John's narrative.
Luke 22:59: And about the space of one hour after another confidently affirmed, saying, Of a truth this [fellow] also was with him: for he is a Galilaean.
Contradiction with Matthew 26:34
Jesus predicts Peter's denials differently than how they are presented in John.
Matthew 26:34: Jesus said unto him, Verily I say unto thee, That this night, before the cock crow, thou shalt deny me thrice.
Contradiction with Matthew 26:75
Peter's realization and response post-denial differ from John's description of events.
Contradiction with Luke 22:34
Jesus' prediction in Luke emphasizes the crowing of the rooster which contrasts with the unfolding of events in John's account.
Luke 22:34: And he said, I tell thee, Peter, the cock shall not crow this day, before that thou shalt thrice deny that thou knowest me.
Contradiction with Mark 14:68
Peter's initial denial differs in its depiction compared to John's account of the denials.
Mark 14:68: But he denied, saying, I know not, neither understand I what thou sayest. And he went out into the porch; and the cock crew.
Contradiction with Luke 22:56
Different details in the confrontation with the servant girl compared to John's account highlight narrative differences.
Luke 22:56: But a certain maid beheld him as he sat by the fire, and earnestly looked upon him, and said, This man was also with him.