At the kitchen table, when Blanche complains how her children showed their nanny more affection, Dorothy grabs her left hand to comfort her, then lets go. But when the shot changes, suddenly Dorothy is holding Blanche's right hand.
After Norman closes the book, he puts his hands on his clay sculpture. In the next shot, his hands are on the book. In the next his hands are back on the sculpture, which is now sitting on the book.
Children's Protective Services would not take 48 hours to claim an abandoned child, even if it was left by the parents on purpose.
It is mentioned that Emily is 6 months old but when her father comes to pick her up, he says he and his wife just had triplets. The average length of a pregnancy is 9 months.