I agree with robgrauert about the sound.  It was very hard to hear the subjects.  And I thought the girl talked way too fast.
I'm not sure I agree with the shotgun mic suggestion.  Though I don't know the technical details of why, most people often say a hypercardioid mic (a form of omnidirectional mic) sounds more "natural" indoors.  Of course, if your on a tight budget, a shotgun mic will usually sound better than the camera's mic and will generally be useful in a lot more situations than a omnidirectional will (i.e. if you can only buy one mic now, get a good shotgun like a Rode NTG-1 or NTG2).
I also agree that the wavy letters weren't very appealing.  They waved so much it was kind of hard to read them.  If you can decrease how much the letters move, that would work much better.