It wouldn't surprise me if he did mess up on a couple more occasions. Most importantly, Bonucci is showing that he can go a full match as a good defender (well player, even, he's doing well in attack as well), instead of performing nearly all the match with one or two huge mistakes.
I hope the last few performances have shown to his doubters why certain members (including myself) think Bonucci can definitely have a career at Juventus.