One paragraph plot summary : On a set, while crews are filming a movie, a faceless ghost appearing and it's disturbing casts and crew members. The ghost wants them all to leave this place. If they don't, then a lot of bad things will happen. The next day, the Mystery Incorporated gang is arriving to that film studio because Velma's relative invited them to visit. During exploring the studio, they learn the event currently happening. They put themselves as stunts in the grou[ to lure the ghost out. By doing this, they get the clues. Step by step, they uncover who the ghost really is. But they didn't put him in jail because no one's got hurt. Later, because of the reason why that one who is responsible for those disturbances did those things, they create the film in the other way around which let the Mystery Incorporated gang ended on the red carpet.
Episode 11 is simple and the reason for why that one did those disturbances is kind of difficult to guess, in the other word, it's unpredictable, but it's still simple. Still, it's so much fun. There are some funny moments. I even laughed out loud when I saw those scenes. So, I'd say it's very good to enjoy.
As for me, if they've made it a bit complicated than this, it'd be better. That being said, I'm not saying that the current one is not good. It's indeed very enjoyable and I've enjoyed every second of it. Thus Scooby-Doo animations are really cool and I'm looking forward to see the next and next episodes.