Other mistake: On pursuit of one of his conquering strategies David comes into the tennis hall where his present belle Gretchen is waiting. He looks around and calls out for her, although the full moon is shining through the windows and she is standing in the middle of the court, quite visible in her white dress. (00:06:35)
Other mistake: Sabrina attempts suicide by starting the engines of all eight cars in the Larrabees' garage. When Linus comes and rescues her he first turns the engines off, and when he is through with only half the noise dies already. (00:15:25)
Other mistake: In analogy to David's mishap with the champagne glasses old Mr. Larrabee crushes an olive jar when he sits down. However, in contrast to David he puts the jar into the front pocket of his pants, and olive jars don't break even if you sit on them (remember what he did to one when he tried to get the last olive out.). (01:46:55)
Other mistake: At the beginning, when Sabrina describes the Larrabee family, she says that David is listed as a $600 deduction on Linus' income tax return. Two problems: 1) Shortly after Sabrina goes to Paris, Linus is shown sending David a memo to remind him that he is a junior partner in the family company, and is eligible for retirement - based on his one year with the company. 2) Both David and Linus still live with their parents. If David could be claimed as a dependent, I should think it would be by his parents.
Answer: I've seen this movie numerous times over the years. Linus always addresses his secretary as "Miss McCardle."
raywest ★
Linus does call her Mrs. McCarthy about 11 minutes before the end of the movie. I checked several times. It's true. It's a mistake.