I noticed the intro sounded a little higher.The reason for this is because the latest episodes that have been released online were originally broadcasted in Australia, which uses PAL instead of NTSC. PAL uses 25 frames per second (rather than the 24 frames per second that NTSC uses), so the episode plays a tad bit faster. So while it isn't that noticeable watching it, the audio is a dead give away (ex. the intro, certain characters voices, etc...)