One of the strangest phenomena has appeared in this episode, that is when all the rats in the whole town pulled together to an old cellar. In turn, one by one, exploded, just like a jelly. It seems that opening the door to the Upside Down world has affected the behavior of these animals. Or another explanation is that a mysterious creature has been released into town, and somehow, it controls the thoughts and actions of the rats. This makes many people remember Mind Flayer at the end of Part 2 and it seems that what was left in the previous section will continue to “haunt” the children in this section.