Ah yes, the most platonic of all friendships
I can recognize the significance of most of the foreshadowing in the OTGW opening, but the two boys sailing a boat? It's a model of the one in "Lullaby in Frogland," and the boys look like Wirt and Greg. But their clothing isn't their Halloween costumes or anything that they'd be liable to wear back home--it's decidedly Victorian. In what context would this happen? The other scenes all seem to be "actual" events in the Unknown, but do you have any idea what's going on with this one?