Contradiction with Matthew 27:57-58
Jesus was already dead and had been for some time, according to Joseph of Arimathea when he went to Pilate, contrary to Pilate's surprise in Mark 15:44.
Matthew 27:57-58: When the even was come, there came a rich man of Arimathaea, named Joseph, who also himself was Jesus' disciple:
Contradiction with Luke 23:52-54
Joseph asked for Jesus' body and buried it before the Sabbath, with no indication of Pilate's surprise at Jesus' death, which contradicts Mark 15:44 where Pilate is amazed at how quickly Jesus has died.
Luke 23:52-54: This [man] went unto Pilate, and begged the body of Jesus.
Contradiction with John 19:31-33
The soldiers found Jesus already dead when breaking the legs of those crucified, indicating no surprise at his death, contrasting with Pilate's reaction in Mark 15:44.
John 19:31-33: The Jews therefore, because it was the preparation, that the bodies should not remain upon the cross on the sabbath day, (for that sabbath day was an high day,) besought Pilate that their legs might be broken, and [that] they might be taken away.