The afternoon word on the tweet on the opening day of Avengers: Age of Ultron was that there was subtle homage to the greatest super hero ever:
An extra was wearing a Bo Jackson jersey…
… or at least an Auburn jersey with what looked to be a 34 on the back. Or least a jersey that looked like an Auburn jersey with what looked to be a 34 on the back. Or least a jersey that looked like an Auburn jersey but could have been a Cleveland Browns jersey but that, no, almost certainly is an Auburn jersey with what looked to be a 34 on the back.