The chest of the sculpture used as an oven is decorated with two metal disks, they are bicycle brakes, introduced only at the end of the 90s.
When the family is walking away from the vet, the mother's bra straps are clearly visible and black under a white top. In the 1970s, women only wore white or nude bras with a white top and never, ever showed a bra strap because that was considered to be promiscuous.