Historically incorrect Christmas songs

I missed this last week while on vacation, but it's still worth a post. Ted Olsen at Christianity Today has a list of Christmas songs that are "just plain wrong."

First on the list, "I Saw Three Ships":

Bethlehem is landlocked, so it is historically improbable that our savior Christ and his lady came sailing in on Christmas day in the morning. But that's not all that's problematic about the song. Where's Joseph? If it's just Jesus and Mary, why do they need three ships? Surely Mary didn't just arrive in Bethlehem the morning of the birth...