After Lyon says goodbye to Anne and her entourage at a restaurant, we hear Jennifer hastily saying, "I'll have the butterfly steak." But the pan from Lyon to Jennifer is too quick, and her mouth isn't moving as she looks at the menu.
In the famous catfight scene in the dressing room, Neely O' Hara was wearing drop earrings. After she pulled off the wig off Helen Lawson, the earrings were on her ears. She ran into the toilet room and the earrings mysteriously disappeared by the time she flushed the wig down the toilet.
When Anne goes to her room at the hotel she opens her window to let a soft breeze flow through the room and then goes to bed. However, there was snow on the ground in NYC and she would have been freezing with the cold air coming in. The next day she drives away from NYC while there is still several inches of snow on the ground.
Right after Lyon Burke (Paul Burke) advises Neely O'Hara (Patty Duke) to check into a sanitarium, he leaves, and Neely goes to a phone, dials it, and then picks up the receiver to speak to someone already on the line.