When Tori and Andre are trying to choose a song to sing for their re-auditions, Andre gets up to make hot cocoa and there are two glasses with green liquid in them on the table. The next time we see the table the glasses are gone.
When Tori packs up her things in her locker to go home, there is a red button on her locker. In other episodes of the series, there is no red button on Tori's locker.