1)It takes time automatically. TO view your time, select your team, then the level, then press A button. After this, move it to the right to view the second objective.
2)I dunno. Coding maybe? Or a spot for footnotes at the bottom of the page.
3) Team Sonic extra mission is the same exact level, only you have to finish in a time limit, therefore making it worthless to submit times for. You can pick th better of the 2 sonic missions to submit. Hope I helped you.