Omissions in the Gospel of Mark

The Gospel of Mark has interesting omissions, when compared with the other Gospels:

Like the Gospel of John, but unlike Matthew and Luke, it has no stories about the Nativity or the childhood of Jesus.
Unlike the other three gospels, it has no mention of the Samaritans.
It has no Parables.
The lament of Jesus over Jerusalem ("O Jerusalem... how often would I have gathered thee...") is found in Luke and Matthew, but not in Mark.
Unlike the other three gospels, the Gospel of Mark (in its oldest and most authentic versions) has no account of the Resurrection of Jesus, and no post-Resurrection appearances.