"You Can Still Use Trapped Sprits Powers Before they are free!" - Mr.X

"You should haunt the people even if it's not yout job in that mission, without plasma, you can't do anything. When you need to open something, first try Tremor power nearly. Before completing a mission, try to free all or at least most housebound spirits, they'll help in future mission a lot." - noone

"In Weird Seance, you will need to have visited the big house on the right of Haunting 101, before you can get Lucky (the cat on the pinball machine)." - LuckyCat