During the scene when Mary and the children are picking up the nursery, you see a rocking horse which is standing upright. A short time later, however, the horse is laying on it's side and Mary stands it up as she walks past it.
I think they probably knocked the horse over when they were running around trying to get everything cleaned up asap.
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peaches writes:
Use your imagination! There are 101 ways that horse could have fallen over again, I don't think this is a slipup. I think you should have read the instructions before you enters this one, they ask is there any explantion for the slipup - in this case? YES!