Other mistake: The actor playing John F. Kennedy in no way resembles the late former President.
Other mistake: When Dandy goes on his shooting spree, the pistol he uses holds 9 rounds. When Jimmy returns to find everyone dead inside the main tent, there are 11 dead bodies laid out.
Camp Redwood - S9-E1
Other mistake: Most of the mud on Brooke should have been washed off as she walked through the downpour to enter the cabin with the others.
Camp Redwood - S9-E1
Other mistake: When the group enters the infirmary, none of them are soaked from the downpour of rain happening outside.
Answer: Moira's ghost form is unique because of the way she was treated when she was alive. To people who do not sexualize her and truly understand and view her for who she really (namely women), she is seen as an older woman. To people who objectify and don't care to see the truth (namely men), they see the young seductive Moria. It's a strong directorial choice to eventually show how Ben Harmen comes to terms with the truth of the house and himself.