The free game review is quite low depth, i.e. the computer doesn't analyse very far. I think you get one free depth 20 (10 moves) per day, and unlimited free depth 10 (5 moves) game reviews per day. Therefore the computer is far from perfect and will often get things wrong. For example, try and take a game from the Computer World Championships into Stockfish depth 10, and it will say many of those moves are inaccuracies or mistakes. For improvement going over your games I recommend one of the paid subscriptions on chess.com. For example I have Diamond, which gives unlimited depth 30 review as well as an opening explorer
A friend and I played a ten minute game and after went over the game review together.
We were really surprised that the analysis, when we went through the game move by move was quite different for each player. Also the game report was also different when it tallied up the moves.
For instance, my game report said one great move for me- hers said two great moves for me, etc.
Why would this be so since it was the same computer analysing the same game?
Just curious...