Deliberate mistake: The ghosts often walk around furniture even though it was established that they can walk through solid objects.
| All season 4 mistakes | Mistakes | |
|---|---|---|
| 1 | Happy Holiday | 0 |
| 2 | Speak as ye choose | 0 |
| 3 | The Hardest Word | 0 |
| 4 | Gone Gone | 0 |
| 5 | Poached Guests | 0 |
| 6 | Not Again | 0 |
| 7 | It's Behind You | 0 |
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Suggested correction: Just because they can walk through solid objects doesn't mean they have to. They were used to walking around things in life so just carry on doing so as a reflex action. They often use open doors too, only walking through walls when it's more convenient for them to do so or the doors are closed.