Even if they could win a legal fight over a haunted house, their videa evidence is weaker than weak. Bowling pin fell over? Just because no one was touching it?? People were walking on the floor. All it takes for a floor board to wobble under them for it to fall down. Now if it fell when no one was in the room, maybe. If it fell repeatedly, maybe. As for the light, lots of houses have the odd tricky wiring in them.
As for the people suing??? I WISH i could rent a haunted house!! Would be awesome. I would pay extra for it. The landlord will let it go to court, make a bit of a buzz, then evict those deadbeat tennants and rent the house out as a haunted house for twice what they were paying.