I would have loved to see some kind of follow up to "As You Were," where all of the loose ends were cleared up. Was Spike REALLY holding those eggs for a friend? Was he REALLY an international arms dealer? What happened when the customers found out that their deal had fallen through? How did Riley 1) know that Buffy was working at the DMP when he hadn't talked to anyone before showing up there; 2) just happen to have a kevlar commando suit, complete with boots and gloves, in Buffy's size (Sam was about 6 inches taller than Buffy, so it wasn't hers); 3) know precisely the right moment to show up at Spike's crypt in order to obtain the maximum embarrassment factor for Buffy; 4) get that stupid scar in the first place? If Spike really was the Doctor, why did Buffy let him live? If he WASN'T the Doctor, why didn't Buffy try to find the real Doctor? Riley wasn't there to do it.
All of those and a couple of dozen other "Why's," "What if's," and "Oh, you have GOT to be kidding's" left unanswered, unexplained, of just completely ignored after the final credits rolled.