Thanos' snap, locating the Mad Titan only to discover that he has destroyed the Infinity Stoes. Five years later, after the world tries to move on and accept their losses, Steve Rogers and friends can't give up trying to bring everyone back. Fortunately for them, Scott Lang returns with a plan to get the powerful Infinity Stones back in their possession.
The most prominent reference to the Back to the Future installment: don't talk to your past self, and no betting on sporting events. Even later in the film, while discussing the actual rules of time travel before a test run, Scott is disappointed that Back to the Future is "a bunch of bulls**t."
With multiple references to the classic time travel blockbuster, it's fun to discover that the massive climax of Endgame had a big Easter egg from Back to the Future Part II that a lot of fans may have missed. Reddit the big moment of Tony snapping Thanos and his army away. The first image of victory after Tony's snap arrives as Rocket Raccoon is about to be hit by a Chitauri Leviathan. As Rocket braces for the impact, the creature turns to dust and leaves him completely unharmed.
This quick scene mirrors Marty Mcfly's encounter with the Jaws 19 hologram in the then-futuristic 2015. The cartoon-looking shark tries to take a bite out of Marty before disintegrating into pixels. With both scenes next to each other, the reference is obvious - but even without knowing it's a Back to the Future II reference, the Endgame moment is still very cool.
Subtle references like this are just one of the ways that revisiting movies can be rewarding for fans. Avengers: Endgame directors Anthony and Joe Russo infuse their Marvel movies with many homages to classic films - just as they once did with Community episodes like "Basic Rocket Science" (which plays with the tropes of space travel movies) and "For a Few Paintballs More" (which is packed with Endgame is now the highest-grossing movie of all time, it's likely to become influential to future filmmakers in the same way the Back to the Future movies were.
