When Woody Allen started to write the movie back in the 70s, his main idea was to tell how a family of intolerant rednecks changed completely for different reasons after a while in New York.
The role of Boris Yellnikoff was original written for Zero Mostel. After Mostel's death in 1977, Woody Allen set the screenplay aside. However, with a potential actor's strike during 2008-9, Allen chose this old screenplay to be his next film. Furthermore Zero Mostel and Larry David both played the role of Max Bialistock. Mostel in the original Producers and David in the play within a show representing the main story arc from season 4 of Curb your Enthusiasm.
In the scene where Boris is visiting the woman he accidentally injured, set in her hospital room, the boom mic is clearly visible on the left side of the screen.
After Melody firsts enters Boris' apartment and is offered a can of sardines, she removes the high school jacket she is wearing. Then, after the next jump-cut, she is again shown in the process of removing the jacket.
Boris Yellnikoff: Love, despite what they tell you, does not conquer all, nor does it even usually last. In the end the romantic aspirations of our youth are reduced to, whatever works.