Goofs

When Corie puts the newspapers in the refrigerator, the bottle she had earlier put there is gone.

During the opening credits, while the horse and carriage are making their way to the Plaza, an obvious double is standing (or should I say "sitting") in for Robert Redford. It's harder to see, but I think there was possibly a Jane Fonda double early on in the sequence. She is definitely the one who throws the bouquet to the mounted police officer, but Robert Redford doesn't show up in the carriage until the close up at the Plaza.

When Paul falls over the park bench, his position then changes when seen in the close up.

When Paul asks the repairman if he wants a drink, the amount of liquor in Paul's glass changes.

Glasses on hansom driver during opening title sequence.

Bloomingdales calls to say the furniture won't be delivered. The phone was installed only minutes earlier so Bloomingdales would not have the number to call. NOT A GOOF: Bloomingdale's (or anyone else) would in fact know the number to call. You were assigned your phone number the same time you signed up for service. Nobody had to wait until the day of installation to know what their number would be. It wasn't up to the installer.

When Paul is going down the stairs after fighting with Corie, the shadow of a mike can be seen on the wall behind him moving backwards and forwards with his movement

When Paul comes out of the bathroom complaining about not having a bathtub (at about 24 minutes in), the shadow of boom/equipment can clearly be seen on left of screen.

In the hallway, Paul opens Ethel's pink pillbox. When she reaches for a pill, she accidentally closes the lid but still pretends to pick out a pill and put it in her mouth.