Is Mark 11:1 in Error?

In his book "Who Wrote The Gospels" (1997), Randel McCraw Helms stated that, "Mark was as unfamiliar with Palestinian geography as he was with the outline of Jesus' career:

They were now approaching Jerusalem, and when they reached Bethphage and Bethany, at the Mount of Olives, he sent two of his disciples...(Mark 11:1)

Anyone approaching Jersusalem from Jericho would come first to Bethany and then Bethphage, not the reverse. This is one of several passages showing that Mark knew little about Palestine; we must assume, Dennis Nineham argues, that "Mark did not know the relative positions of these two villages on the Jericho road."" (page 6)

There are several things to note here before we go charging Mark with an error: