In the copyright notice, the Country of First Publication is given as "United Stated of America."
In Venice when Woody Allen is singing "I'm Through With Love" the vaporetto boat in the background is going backwards, along with a smaller boat a little later.
Holden (Ed Norton) and Skylar (Drew Barrymore) are engaged to be married but during the scene in the jewelery store Holden is wearing a wedding ring on his ring finger. (The man of course does not wear a ring until after the wedding).
In the x-ray room, the nurse calls for Katie to come and look at the engagement ring in Drew's stomach, but the nurse that arrives has "Judith" on her name badge.