When Buckwheat and Porky get the cake at the store, it's whole, but when they sit outside on the porch to eat it with Spanky and Alfalfa, the cake is suddenly cut into pieces for them.
A large poster is in the window to the left of the door to the store, which the boys look through on arrival. When the boys go back in the store after eating, the poster is gone.
The freckles on one of Alfalfa's twin siblings all but disappear when he gets their milk bottle.