Steppenwolf reference?
In Nobel laureate Herman Hesse's 1927 novel Steppenwolf, the main character Harry Haller philosophies about his personality and in some episodes he encounter many different bits and pieces of himself (or his soul), of different ages and moods. As I recently read this novel, I got to think about Harry Block. Could Woody Allen have been inspired by ideas in this book and as an homage (or clue) named his character as in the book?
It was a while ago I saw this film, but as I recall it Harry Block uses different pieces of himself to build different pices of the story. There are some resemblences.