>>96324763
There's a lot of inside jokes that are more or less just ripped whole-sale from the internet community that surrounded the show almost 20 years.

The show itself is not heavily self-referental beyond the cabbage salesman which was more poking fun at the fact they kept destroying carts of goods in chase sequences every episode and this guy, coincidentally, was always the guy getting his shit rocked. The viewers picked up on this bit and hammered the joke so hard that it became unfunny by the third time the cabbage salesman appeared. Same thing with the cactus juice.

It's weird because it IS reddit/tumblr humor that is incredibly dated BUT the cards are more a reference to these jokes than the actual show itself. If I was designing the set I probably wouldn't include them mostly because it would be weird to bring up fan jokes. This is the equivelent of Chewbacca getting a medal at the end of Episode 9.

TL;DR do not judge the show based on this. It's actually very good for a children's show. If you already watch anime this isn't a stretch in the slightest. This presentation is more on WotC being gay.