The "Raingutter Regatta" Boats that the boys make can be easily compared to animated media in general.
Most of them being aimed at children done very cheap to produce, especially if they can make SO much at a short amount of time. Much like how the boys have to make so many boats in a small amount of time.
Stan and Tolkien claimed they learned making these boats during "COVID Camp". This can be a reference to how during all the COVID lock-downs and social distancing, animation projects were the only media that could be made, as everyone involved can do their part with their computers at home; and thus were in high demand back then. It's also a bit Harsher in Hindsight when COVID restrictions were lifted, A LOT of animation projects were canceled/sold off by their respected streaming services just a few years later.
Cartman becoming successful and happy in the Bad Future presented in Post Covid while he becomes homeless, alone, and miserable in the good future presented in Return of Covid makes much more sense after seeing this special. Cartman and his friends broke off their friendship with each other in the "Vaccination Special", so with no one to take advantage of, Cartman might have been forced become a better person to take care of himself. When the future changes and the boys remain friends with Cartman, the latter continues to take advantage of their kindness using the money they donated to him get breast implant. The boys will probably just refuse to give Cartman any more money, knowing that he'll just waste their charity on pointless things, which could also lead to Cartman blaming them (along with his mom) for his misery and the boys eventually deciding to cut ties with Cartman, thus explaining Cartman's terrible fate in the reformed future.
