Spruce Goose Question?
 

Watching it's one and only flight the other night on the tele was surprised to see what looked like a spoiler/s going up and down
in sync with it's minor pitch changes, above the inboard portion of the left wing I couldn't see the right.

Have never seen a large piston aircraft with spoilers before, and these appeared to be truly massive, on an appropriate scale to the aircraft anyone have any more insight?

On an upswept wing, an inboard spoiler will have little pitch moment. It would have been a spoiler used for lateral control- a lift spoiler for one side only.