this slip up is when Kat and Casper have already gone down to the secret basement. Kat rides the chair down. it stops and stayes at the end of the track. then it cuts to the bad guys riding a chair down. hmmm... i only saw one chair at the top of the stair case? then after they rode it down, it stopped. after they fight over the juice stuff, kat gets in the chair and it goes back up the track, but there was no sign of the other chair? interesting huh? :)