In the episode "Try, Try again, where Jan thinks that she has no talent, her parents encourage her to try several different things. One thing she tried was tap dancing which got on everybodys nerves. Well, the floor in the girls bedroom is carpeted. Jan is praticing her tap dancing in the bathroom and Marcia and Cindy are standing in their room next to the bathroom door, mad because she wont stop. There is a shelf in their room with a glass figurine. Because of Jan's loud stomping and tap dancing, she makes the figurine fall to the floor and it makes a loud noise as it breaks. There is no way the figurine would have broke on a carpeted floor, and even if it did break, it wouldnt of made that loud breaking noise.