I must say those bloopers (NG-shuu) were poor... It was funny but I only smiled while watching it. I laughed at it only twice. The previous ones were much better. But stil it's worth watching it but it's better not having big expectations.
For those who don't know what those bloopers are about and hasitating if they wanna watch it or not:
9 short episodes are scenes about 3 minutes long and mostly make some scenes from season three funny. Some scenes could be considered as bonus scenes because it shows a little detail that some fans could be interested in. For example what book Chihiro was reading when Akashi came to him or a picture of Idol that made Takao laughing so much.