The lack of chemistry is notable. They say they love each other, but I don't sense any actual affection between the two. Keegan-Michael Key's character has been consistent throughout that he doesn't take the relationship as seriously as Cecily Strong's character does. Except for arranging for the candy cascade at their first-anniversary dinner three years earlier, I don't think he's done anything that would be considered to be a positive for their relationship (or frankly, at all - has he said anything positive for two episodes?). And she seems to be constantly pushing him to feel differently about their relationship than he does.
Minor plot holes:
Would they not have tried to call the modern-day retreat hosts shortly after arriving at the Inn the first time? Surely, they would realize that there would be a major search expedition for them by that point. But they are just hanging out the next morning, having a leisurely meal, seemingly not caring that hundreds of people are probably combing the woods looking for them.
Also, when they try to cross the bridge in Episode 2, they aren't carrying their backpacks anymore.