Mary (Marlo Thomas) refers to her family's Building and Loan as a savings and loan twice, once in the taxi in the in the "run on the bank" scene, and another time near the end in the "Merry Christmas Bedford Falls" scene. Other times in the film, she correctly refers to the company as the Building and Loan. Savings and loans did exist at the time period in which this film takes place. She just got the name wrong a couple of times.