The pilot of the Saturday display was called to the RIAT FCC to explain himself after he landed, I gather the conversation lasted more than the cursory 5 minutes and facts of life were clearly explained to him. He wasn't the pilot on Sunday.
I was on north side of FFD at the time and the aircraft clearly looked to sideslip down after it did its manoeuvre. I wasn't sure if this was an optical illusion or similar, brighter people than me have since indicated it was not an optical illusion.