When Geri and Mick first discover the skeleton, the skull is fragmented, with the jaw bone clearly disconnected. When they later find it in the back of Roger's truck, the jaw bone is now firmly attached and they have to forcibly pull it off.
When Mick, Jerry and Roger goes fishing, Mick is ,fishing in the bait box with his hand inserted and rummaging. Later, when Jerry and Roger are alone, the bait box tips over with half a box of worms and no need to rummage.
When Mick, Jerry discover the skeleton, it has no sternum nor is its jaw attached. Later, after Jerry is fishing, he returns to the truck to a complete skeleton. Furthermore, the skeleton in the dirt is female while the truck skeleton is male.
The first in the kitchen Mama declared, "...the fridge is out. All the food will spoil!" There is nothing in the fridge, not even shelving or stains on the walls. I guess 1976 didn't think there would be "pause" buttons :-)