When adding disambiguation comments to recordings, you shouldn't be allowed to manually add parentheses around your comment. This is an easy mistake to make, seemingly, since these comments are surrounded by parentheses when displayed on the website.

Instead, you should get a warning that lets you know that the parentheses are added automatically by the server. Or, perhaps better yet, parentheses added here should be silently ignored and removed from the comment, without bothering the editor.

This came up during this edit: http://musicbrainz.org/edit/19564139