The window that Ernest T. Bass breaks with a rock in the very first scene is clearly made of paper, yet we hear the sound of glass breaking.
Ramona brings the rock outside that was thrown through the window and then handled by a few people. Barney explains about the boys in the lab checking for fingerprints. The rock is handled again by Mrs Wiley and Mr Schwamp. A few seconds later, the rock is dropped. Barney pulls out a printed handkerchief to pick up the rock. When they return to the sheriff's office, Barney puts the rock on the desk. However, this time, the rock is in a white handkerchief.
When Andy, Ernest T. and Barney are outside at Mrs. Wiley's party, the Taylor house and garage can be clearly seen right next door. In most episodes, Clara Edwards lives next door to the Taylors.