When June looks at the magazine cover with a picture of Violet Rutherford kissing Beaver on the cheek, her thumbnails are not painted. A moment later, June's fingernails are seen painted as she says to Ward "Isn't that sweet?" Obviously, a hand model was used for the first shot.
The type of flash on Fred's camera uses single-use flash bulbs. He is shown taking 3 flash photographs without changing the flash bulb.