Out playing your opponent the whole game and then randomly blundering a piece is seriously one of the most frustrating things a person can experience on this planet
0:15 d6 is actually a mistake here. The play is trading queens first and THEN play d6 with check, you're gonna end up picking up the knight and the bishop and now you're 2 pawns up and your king is MUCH safer, +6 evaluation.
00:48 bishop takes on b6 is also a mistake by black, but the play for white here ISN'T to take the rook on g8 (even tough it's still winning) , it's rook to c5 with check, you can't take the rook cause Qxd7 is mate in 1, it's +8 cause you're gonna pick up both bishops making you 2 pawns ahead, and then trade 1 one of your rooks for black's rook, and the other one for the queen actually, leaving you with a queen vs rook endgame, where, again, your king is much safer.
Finally Qxb8 is obviously a mistake, the play is Qxg7 (+3 evalution), it's tricky, but basically you're gonna pick up a bishop, trade everything else and end up with 6 pawns vs 2 pawns and a bishop and your pawns are just unstoppable (+6 evaluation at that point)
This took me a while to figure out, so for anyone wondering: - He did not miss the queen on b8 and the rook retaking (he just drew the arrows wrong). - Also he expected the king to be in b7 at the end, hanging a bishop after Rxd6 - I guess the other idea was to play: Re7 Bxe7, Rxd7+ and recapture the remaining bishop e7
... But black's king went to c7, protecting both bishops so the whole thing didn't work