Jaitea said:

Don't know why the tower was blue, but it makes no sense to reveal the Executor first before the shadow

Yup, the shadow should be the shark fin.

Couple that with the direction of travel issue and I think those 2 things clinch it as far as editing structure goes.

But then there's also the lighting issue. IF the close-up of the bridge we see is supposed to be a SSD then the lighting on the SSD switches sides between shots.

I think the blue coloring was either flat out a mistake, or someone's clumsy attempt to tease the SSD with incorrect footage (which, as has already been pointed out, happens often).

EDIT: My money would be on it being a mistake....I'd guess that whoever was recoloring the SSD model from grey to blue decided that the SD bridge filling the screen meant that it must have been "the big one"....and incorrectly colored it blue. And then in subsequent re-releases they just stuck with what was already there when doing color touch ups.