Looking forward to "The Last Tough Customer" after seeing that preview (even if I still can't completely get past the new animation), but agreed that Arthur seemed way out of character for teasing Sue Ellen like that in the other clip. He was forced to wear an odd sweater before ("Meek For a Week", I believe).


While looking at the episode list on Wikipedia, I saw someone added these false Season 17 episodes. They're so random and/or generic that I thought I'd post them here before they get removed. 

Season 17 (2013-2014)
 
1. Arthur And The Duststorm: Arthur, Buster, Brain, Muffy, Binky, George and Ladonna get trapped in a dust storm.
   Buster gets a B: The class takes a big test and when Mr. Ratburn hands out the scores, Busters paper shows a B.
 
2. The New Rule: Elwood City has a new rule that no one can EVER get mad at someone ever again, Binky tries not to bully anyone, Buster will never get upset, Francine will never yell again and Muffy will never be a show off and never get mean at everyone.
   Francine Gets Shocked: Francine gets really sad when Nemo gets sick.
 
3. Arthur Sees The Light: Arthur and his friends see the northern lights.
   The Haunted House: The tibble twins make a haunted house to scare D.W., Emily and James.
 
4. George Bends his Antlers: Georges antlers get stuck in his locker again and when he tries to get it out, it tears off his head.
   The Mystery: Buster cracks the case about Arthurs missing book.
 
5. Muffy's Date: Muffy starts to be in love with Arthur and Arthur is shocked!
   Busters Date" Buster has a crush on Francine and Francine is shocked!