That error message comes up whenever the demo in question ends up with a different result to the way the demo says it should when it's run through. Like in budget racing games where the ghosts always seem to veer off course and then magically reappear two metres to the left.
(I'm pretty sure Mario Kart 64 did that. Lazy buggers.)
You'd usually see it where the room's changed since you solved it or in rooms with brains. There was a lot of work done to make brains reproduce all the idiosynchrocies of AE brains, but some things will inevitably have been missed. And brains with arrows has all changed as well.
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What do you call an elephant at the North Pole?
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