A Tiki Scare is No Fair - S2-E6
Continuity mistake: The Witch Doctor seems to be wearing just his robe and mask. When he's unmasked as Mr Simms suddenly we can see hints of his suit jacket sleeves sticking out.
A Tiki Scare is No Fair - S2-E6
Continuity mistake: When the witch doctor's caught by the statue his arms are free. Just before they unmask him suddenly they're trapped at his sides. When he responds to Fred his arms are free again.
Chosen answer: A ghost wouldn't have to keep any food in the fridge - they don't need to eat. So it is one thing that proves the ghost is not a ghost.