When Buzz and the other toys are entering Al's Toy Barn (40:15 if you have the DVD version), notice the relationship between the checkstands and the store shelves. The camera is positioned to look almost directly between checkstands 3 and 4, so it's easy to keep track...

- Aisle 5 is behind checkstand 3

- The shelf-end visible between checkstands 3 and 4 looks like the end of a barn, complete with a "window" and a sloping "roof"

A few shots later, when the camera cranes up over the toys to show the size of the store, notice that aisle 5 is now behind checkstand 4, and the shelf-end visible between checkstands 3 and 4 has an array of toys hung on it. The shelves are basically shifted one aisle to the right.