The People often marks non-people as faces. The most notable one is anytime there is a Starbucks cup, it always marks the Starbucks Woman logo as a person. Though of course course countless other misidentifications but that is the most common one I've noticed in the years in LR Classic and now in LR Cloud.
While hopefully the algoritm improves, in the meantime is there a way to mark a face as not a face to help teach the system? The only option is "Hide Face" that I see. But that won't signal to LR that it's not a face thus it won't improve and also not sure if Hide Face may mean it will still try to find that non face in other photos?