I loved the episode but found myself disappointed with the last 5 minutes, despite Matt Smiths superbly emotional send off. For a number of reasons I feel they really missed an opportunity to do something special.
So they poured some budget into the massive regeneration explosion and exited with a beautiful CGI fade to dust. Goodbye Matt Smith. We then land in the aftermath of the explosion with the survivors in the carnage and a lost and confused Clara. She hangs up the phone on the Tardis (An odd directoral decision, the phone wasn't a beat and had no relevance) and enters it there after. End scene, end set, end extras, end special effects, end budget, back in the tardis. The next scene could have been shot anytime in any continuity.
A pair of legs are seen walking up the stairs. Who is this mysterious figure? My anticipation is up, this is going to be a really strong entrance of the next doctor. The costume, the character, the age, the attitude, all laid to bare in a few minutes of glorious screen time. Out with the slaptick, in with the smouldering, darker, older, more mature doctor. Oh, no wait, its still Matt Smith. OKAY. Its your show, you want to give him more of a send off, okay I get it. Meh its a weak editorial decision but lets roll with it. Matt Smith gets to deliver an emotional goodbye, some lovely dialogue. Awww, young Amy. Of course, the actress is grown up now, so hey, lets just stick a little blond girl in a red hat, obscure her face and hope nobody notices (WHAT?!?). Grown Up Amy. Bit odd, but then the life of young Amy had The Doctor as her imaginary friend, its probably fitting the doctor has an imaginary Amy at the end of his. More feels.
Now I liked to quick transition into the leering older man. Given the build up it was a nice contrasting beat. Oooooooh this is going to be good, he's totally going to say something clever and Sherlockesque.
But the few seconds that followed, what the hell was that. Thrashing around, questioning the colour of his kidneys and not being able to fly the tardis? Back to slap stick already. What sort of entrance is that! We have DONE slap stick. I like Matt Smiths Doctor and I don't think he deserves the hate allot of people throw his way, but its time to lay down the slap stick Doctor and have somebody more serious again. Argh.
So yeah, that last scene, so much potential, so jarringly missed. The last scene wasn't needed at all. The Doctor already had an emotional beat as an ancient man in the chair by the crack, unable to pull a cracker, then getting his shot of regeneration juice. The script and Matt Smiths acting already did the exit justice. End it there on that jubilation of the Old doctor discovering he would live again.