>Going all dindu nuffin with the monsters despite their mustache-twirling supervillain behavior (especially from Toffee) complete with making them some hodpgepodge of Amerindians to Mewni's White Man and the Muslims/Heretics to Mewni's Crusaders
>Having a shoddily thought-out setting that tries to be both a Dark Age dump and a Medieval Fantasy kingdom with enchanted smartphones combined with a tone that tries to be a parody of magical girl animu, DnD style fantasy, and Euro fairy tales all at once while also some totally serious exploration of them with progressive politics
>Going through the trouble to make a databook only for the last season to ignore it (namely when it comes to the MHC's characterization and the lack of Septarsis besides cameos from Toffee and Rasticore)
>Underused or abandoned plot points like Marco's tentacle arm
>Trying to give the illusion that it's a setting with consequences yet at the same time tries to be super wacky with an endless status quo (see how they handled Marco growing into a man only to become a boy again)
>Cheaply finishing Marco's romantic loose ends in Jarco and Markapoo (complete with Jackie acting like no attractive woman ever would with her "im nut woth eet staa izz").
>Eclipsa becoming worse and worse with each reveal from her scene with Little Moon onward (largely from how she's never shown acting as selfish as she claims to be) combined with how both her and Globgar were dindu nuffins (despite what we're shown in the tapestry featuring Globgar). Obviously rooted in how the showrunners adored her and ended up making the plot revolve around her.
>the Trump Derangement Syndrome in Season 4
Am I missing any?
