Contradiction with Matthew 26:69
This verse describes Peter being questioned by a maid about being with Jesus but suggests a different location rather than just a specific place where they were sitting, as portrayed in Luke 22:56.
Matthew 26:69: But he denied before [them] all, saying, I know not what thou sayest.
Contradiction with Mark 14:68
This verse shows Peter denying Jesus before leaving the courtyard, which places the first denial at a different point in the timeline compared to Luke 22:56, where the denial occurs as the maid identifies him.
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 John 18:17
This verse indicates that the maid directly addresses Peter in a straightforward manner, whereas Luke 22:56 gives the impression of a more indirect identification of Peter by the maid.
John 18:17: Then saith the damsel that kept the door unto Peter, Art not thou also [one] of this man's disciples? He saith, I am not.