OH BOY TIME TO DUMP A HC I HAVE
Spoilers below, so beware!
Anomalies, as the name implies, are NOT part of the actual show. They weren't scripted to show up, but they appear anyway like cockroaches. They can cause physical harm to the contestants and the staff, but not all of them are harmful. In fact, some of them can be helpful. For example, one anomaly called "Mr. Pedestal" (the giant head taking up most of a room) flat out told the chosen adventurer the answer to a difficult puzzle.