During the Muppet Labs sketch, Dr. Bunsen Honeydew is testing out a new product, the Muppet All-Purpose Tenderizer. After Bunsen breaks the solid dinner plate, his shirt sleeve gets caught on and bends the other plate, before he's had a chance to sprinkle the tenderizer on it.
During Rowlf's reading of "Silence," George's broom keeps making sweeping noises after he stops pushing it.