In the opening salon scene, Roberta is reading the personal columns while waiting for the hairstylist and has a white towel around her shoulders in closeup shots that disappears when she's viewed from behind.
When Susan walks dripping wet from the swimming pool to the poolside chair, her path is already wet from previous takes.
When Susan sees the two criminals on television, the blond guy is called Richard Nolan. In the closing credits, the character is named Wayne Nolan.
Susan/Madonna wears pants with silver pockets when walking in New York City followed closely by Roberta, but the next take after meeting Jimmy, her black pants are different and without silver pockets.
The police throughout the movie are shown wearing baseball caps as their on-duty headwear.
NYPD officers of the time did not wear that.
NYPD officers of the time did not wear that.
When Susan picks up the New York Mirror newspaper, the word lotto is spelled Looto on the front page. This is a play on the tendency of New York tabloids (such as the Post) to run short punchy headlines with broad puns ("loot" being a term for money, in case anyone missed that).
When Roberta is watching Julia Child, the cooking instructions require six eggs. However, Roberta cracks only four eggs into the bowl. Of course people do have their own preferences, like smaller portions.
Reflected in the car windshield as Roberta and Susan walk outside.
Boom mic reflected from the hood of the car when Gary pulls his car in front of the used-clothes store.