When Barney Bear chops the firewood, there are no growth rings on the ends of the logs.
Once the firewood is in the house, some growth rings appear, then immediately disappear again..
When Barney Bear is getting pumped full of air on his bed, there is a blank wall behind the bed.
Once he is full of air and starts violently floating around the bedroom, suddenly there is a picture on the wall to the right of the bed.
Only helium would make someone float in the air, not another person's breath.