Watch the episode "Twisting Away" (the one where Twister/Maurice thinks he's getting shipped away to his aunt Cleotilda). As Twister and company finish cleaning his room, look in the lower left corner. There is no chair. Then when the room is as good as new, there is a chair (mentioned)! How did that get there?!
Actually in that episode at the beginning the parents are talking about funiture, and they had a conversation about puting a new chair in his room, so no it was not a chair appearing from no where..
This is, actually, a valid slip-up. You just said it wrong. On the whole over-look of his room, there was a chair, a bunch of papers, and some other crud. The chair was in the correct spot. When they're finished cleaning, the chair isn't there, where it was before. Then the camera(I don't really mean camera...)zooms out, and the chair is back in the right spot. It disappeared for about maybe 10 seconds, but then it came back. This is indeed a valid slip-up.
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