When you play the HawaiiGirl video with the manual PlayTest, you get a screeching sound when the video repeats or when you do the following:

1 - Click on the Play button and then let it play for a few seconds
2 - Click on the Pause button
3 - Click on the Stop button

Also, If you listen very carefully to the SpeedRacer video, there is no screeching sound but it sounds like a little bit of the end of the video is played after a repeat or when you follow the steps above.

This does not happen with b04. It only occurs with b05.