Anyone who's seen a Marvel movie since 2008 (or any movie since ever) is likely familiar with callbacks and Easter eggs. It seems as though every filmmaker falls prey to that irresistible urge to drop a subtle or shamelessly blatant reference here or there into their creations, suddenly enhancing an already enjoyable experience with an impromptu scavenger hunt. Naturally, Marvel Studios' Hawkeye isn't immune to such juicy temptation.