Alice being a secret agent the entire time makes no sense whatsoever
 Archie and Veronica getting back together in the end
 Cheryl's dialogue 

 Everyone constantly saying "Endgame" is literally the most ANNOYING thing 
 Gargoyle King storyline in general 
 Josie's exit was so uneventful, deserved a better send off (also with her leaving that means most of the black characters are now gone 

)
 Kevin and Fangs are probably the worst "couple" on the show, no development at ALL
 The fact that they are supposed to be in present time while using typewriters, dial up phones, etc. is pretentious and try hard
 The Jailhouse Rock cheerleader thing