I posted this question: https://answers.atlassian.com/questions/210995/how-to-see-the-commits-the-references-an-issue-in-bitbucket-issue-tracker and realize that it could be an improvement to Bitbucket.
I really don't know if I should open this Issue, but it seem right to me.
In my mind it's a simple upgrade, a simple feature, that will turn this Issue Tracker more powerfull.
It could be a session below the "Comments", or a link in the "More" link. The thing here is to search the commits that references this Issue, and just that!