Re that cameo (which I loved and quite understand why Kevin Smith loved too), some things to ponder (in spoilerific white):
- Kevin Smith exists in the MCU.
- Kevin Smith’s art exists in the MCU.
- Words that Kevin Smith wrote are in a MCU movie, making him a screenwriter for the MCU (albeit an extremely tenuous one).
And getting really meta:
- Stan Lee’s cameo is him playing himself, on his way to make a movie where he played himself, which he also did in real life.