At the beginning of the story, the narrator (the adult Mary Katherine) says that she was 7 years old at the time of the story. Later, when Mrs. Thompson is angrily calling the police, she says "Tell Clyde Sellers that one of his policeman threw my 9-year-old daughter out of Oak Park" when talking to the secretary.
After Miriam's long talk with Odess and before Norman gets home from work a a clock appears on top of the television.
At Christmas dinner, sitting to the left of normal are a man and woman assumed to be Miriam's parents. When Norman returns from the kitchen after talking to Odessa and Claudia, there is no chair or place setting for Miriam's father and her mother is now sitting directly next to Norman.
When Odessa and Claudia are leaving the Thompson home after the Christmas dinner, the leaves on the trees are still full and green. Montgomery trees are bare by Christmas time.
The bidding and play in a Bridge game does not make sense according to the rules of Bridge.