How can these inconsistencies about Jesus' tomb be explained?

As it was mentioned in this topic , reading the New Testament side by side, one can pick up apparent inconsistencies in the Gospels by various Disciples. As it was suggested that they should be explained on a case by case basis, lets start with the opening of Jesus' tomb. Looking at four different passages: > Mathew 28:2 > There was a violent earthquake, for an angel of the > Lord came down from heaven and, going to the tomb, rolled back the > stone and sat on it. > Mark 16:4-5 But when they looked up, they saw that the stone, which was very large, had been rolled away. As they entered the tomb, they saw a young man dressed > in a white robe sitting on the right side, and they were alarmed. > > Luke 24:2-4 They found the stone rolled away from the tomb, but > when they entered, they did not find the body of the Lord Jesus. > While they were wondering about this, suddenly two men in clothes that > gleamed like lightning stood beside them. > > John 20:11-12 Now Mary stood outside the tomb crying. As she wept, > she bent over to look into the tomb and saw two angels in white, > seated where Jesus’ body had been, one at the head and the other at > the foot. How is this inconsistency explained by theologians of the various major denominations of Christianity, especially the ones that believe in Biblical inerrancy ?