When Peggie comes back with Luan at about 10 min in we see the plastic head on the table. The first shot shows two grape sodas, the second shot shows what looks like a beer can that Bobby holds to his mouth, then when the shot goes back to the whole table and Bobby we see the two grape sodas again
Dale has gray hair in one frame.
When Luanne brings home the plastic head she is wearing a pink top and jeans but when Bobby stares at the head Luanne is wearing her usual green top and red shorts.