When Jean attends her high school reunion, her name badge initially says "Jean Miller" then later changes to "Jean Hagen," with no explanation.
Obvious stunt double for Richard Kiley in the scene where he falls into the water at Central Park. The hair on the stunt doubles wig is fuller and whiter in the back than Mr Kiley's real hair.
When the servant at the restaurant pours a glass of champagne in Bea Arthurs glass you can see that Richard Kiley's glass is already full but yet the servant goes, and pours into some thing but yet when they show a wider angle one cup is full but the other is empty.
The high school reunion is supposed to be their 40th which would mean Jean and Sam should be around 57 -58 years old .Bea Arthur and Richard Kiley were both 66 years old at the time meaning it should have been closer to their 50th.