Also from tv tropes. At the Star vs. the Forces of Evil panel during the Gallery Nucleus art show, the members of the crew were asked for specific examples of Getting Crap Past the Radar that they couldn't believe made it in the show:
Daron Nefcy and Drake Bridal: The entire "The Banagic Incident" episode.
Dominic Bisognano: The Mushroom Samba in "Goblin Dogs".
Aaron Hammersley: Marco referring to Tom as a predator in "Blood Moon Ball".
Adam McArthur: Janna spanking Marco's butt in the bathroom and commenting on how nice it smells in "Bon Bon the Birthday Clown".
Becky Dreistadt: "Hungry Larry" having three instances of referring to the inflatable Frankenstein's Monster as a blow-up doll.