The Christmas Spirit, Part Two - S2-E10
Corrected entry: Thor can see the ghosts while possessing Sam when Hettie couldn't while possessing Jay.
Corrected entry: When Sam and Jay leave the room after queuing up The Horse Whisperer for Trevor's folks to watch, Hedy, Flower, and Trevor step back to let them by, though they are ghosts and Sam and Jay could have simply walked right through them.
Correction: This isn't a mistake. Some ghosts generally do not like how it feels when people walk through them. And they also affect people who do walk through them, such as Flower making people high. The ghosts intentionally avoid people walking through them, unless they're being devilish like Hetty's husband Elias.
Halloween 2: The Ghost of Hetty's Past - S2-E5
Corrected entry: Flower is able to close a door but only Trevor has the ability to manipulate solid objects; all the other ghosts pass through them.
Correction: You should watch the show more to understand what happened. Flower closed The Vault door. The Vault was made of material that ghosts can not go through, which is how Elias was trapped in there as a ghost. Ghosts basically bounce off The Vault material, so the door closed when it was pushed.
Correction: Except that Jay can't see ghosts and Sam can, so there's no plot hole.
Bishop73