Hi,
I'm really sorry about that it shouldn't happen but things do go wrong sometimes when videos get encoded or uploaded to the server and it was me who double-checked that tutorial as well after it went up on the site. And I agree that watching video that's out of sync with the audio is pretty much impossible, you feel like murdering the person you're listening to unless you mute it.
I'm going through all the video on the site at the moment to correct errors like this so I'll check the interior design right now. Could you tell me which part(s) it is though, because if you downloaded it a while back it might already have been fixed so that you can just re-download the part. I remember thet there was one part that had some error with it initially, hopefully that's the one and it's already been fixed.

Either way the good news is that we can fix it quite easily, I just have to find it so I'll start looking now. Again my apologies,
Nilla