Okay! Yeah, I enjoyed that. I wouldn't be me if I didn't have my complaints, and as always, let's start with those.
Cons:
The original Doctor being a sexist old man really did not work for me, and there are a few reasons why. First off, I have no idea if this is true of the original character or not, but even if it was, it doesn't make sense. Time Lords are ancient beings from a society wholly different from earth. Would they really have the same stupid hangups about gender? Specifically considering that Time Lords have malleable genders? But I actually have a bigger problem with this. See, it's not necessarily the worst thing in the world to have a sexist character in the story. But this guy isn't just some random old codger. He's meant to be the Doctor. We're meant to connect to him and sympathize with him. So if he's going around saying sexist stuff, there needs to be a real reason behind it. Oh, hey, I've just thought of a reason - the Doctor, as in, our current Doctor, doesn't want to regenerate, because he's afraid of continuing on, of growing and changing. Maybe seeing this old version of himself, with very backwards ideas about gender, could remind him that change is often a very good thing. That over time, he can learn and grow as a person and be better for it. There! I've just attached a simple, sensible moral to the whole "sexist original Doctor" bit. The problem is, they didn't do that! The sexist comments were just played for a laugh! Pulease.
It was cool to see Nardole and Clara there for a tiny moment at the end of the episode, but these moments were so fleeting that they felt a bit like prizes granted to the Doctor for good behavior. I remember Tennant's farewell tour as the Tenth Doctor had his final moments, where he went around and saw all of his companions one last time before regenerating. You want to know why that worked? Because these companions did not appear magically in front of him and tell him how amazing he was. He went and saw them in their own lives, doing their own thing, living on without him, and he got to see the way that life moves on.