Surprised so many people thought Artie was going to be Claudia's father. The fact that he was trying so desperately to get to her brother doesn't make much sense if he can just use himself.
Was surprised about the sister, mainly because I forgot she had one. I thought one of the parents or both were going to be sealed in the warehouse or a related facility for some mysterious reason. The evilness of the sister raises the question on how Artie was able to get what he needed from her. Also trying to think about if we saw anyone in the past who could be the sister as well.
Disappointed that the final season is going to be so short, but at least there will be a proper ending to the show.