3) The Watchers
Stan Lee’s cameos have become a staple of not just the Marvel Cinematic Universe, but Marvel movies in general. Over the years, fans have come up with a lot of theories about why he keeps popping up (beyond the fact that it’s a tradition and a way of paying homage to the man who created most of these characters), but one of the most popular has been that he’s one of the Watchers. Guardians of the Galaxy Vol. 2 doesn’t confirm that, but it does show us those cosmic beings meeting with Lee as it’s made clear he’s one of their employees.
At first, he can briefly be seen telling them about the time he worked for FedEx when Rocket and company blast past, but by the time the final post-credits scene rolls around, they’ve had enough of hearing his stories and hilarious end up walking away from him. It’s a fun and clever scene and one which could have significant ramifications for the MCU if this lot return somewhere down the line.