In the shopping scene inside Bergdorf-Goodman, to spite his father, Arthur orders 4 dozen shirts, then goes on to tell the cashier, "I want 14 of these sweaters... all green... I don't wear sweaters..."
A few scenes later in the floral shop, we see Arthur clearly wearing a purple sweater... and then again when he is visiting his Aunt Martha Bach, he is seen wearing a bright yellow sweater. So much for his statement "I don't wear sweaters..."
Linda steals the tie from Bergdorf-Goodman's by itself yet when Arthur helps her into the Rolls-Royce, he hands her a box that contains the tie, which she still has with her when Bitterman helps her out of the car.
At the engagement party, Linda leans over the gentleman's shoulder to get her cigarette lit. Seconds later, while stepping back to observe the party, she asks the same gentleman to light the same cigarette.
Linda speaks with her dad at home. He is in an undershirt and ties a necktie around his neck. Intercut takes show the tie (once tied) is longer in the back than the front. The next shot shows the back shorter than the front. Finally the tie returns to the loner-in-back appearance from the earlier shot.
When Burt Johnson takes the knife out of the cheese and starts to approach Arthur and Linda, she reaches her right arm under Arthur's right arm to clutch him. In the next close-up, her right arm is draped over Arthur's right shoulder as she clutches him.
When Hobson is in the hospital, a two-tiered cart is rolled up the hall of the hospital. The only things on the bottom is a glass container of orange juice and a glass. When the cart enters Hobson's hospital room, a carafe of coffee has joined the orange juice and glass.
When Bitterman drops Linda off at her apartment complex, she looks out the back window of the car and asks that he wait until her neighbor is there before he opens the car door for her. When Linda does get out of the car, the woman is approaching the car from the front, not from the back.
(at around 51 mins) Arthur is at Perry's door, while looking for Linda. Perry's wife opens the door and mouths some of Arthur's dialogue. She mouths the lines beginning with, "Very sorry to disturb you, Madam..." The last line she mouths is, "I hope this is the wrong house, no offense."