>>9671802 PB
I guess the only thing I'd be willing to guess at in terms of hidden technology is probably the EASY ability at this stage to drift between atmosphere and space.
The trick there is in sustaining the belief that SpaceX was something to cheer about. I'll bet the secret tech engineers laugh at the unbridled cheers of Elon's young workforce as they wet their pants looking at ancient technology pull off ancient feats of ancient wonder.