There were 14 drafts of "Henry" written before shooting commenced. The final shooting draft was 19 pages long and was shot in a total of 4 days.
There is only one shot in the entire film, out of over 300, that takes place outdoors.
The real life location of the film's jazz club, Bob's Southern Bistro in South Boston, closed a little over three weeks after shooting for "Henry" took place there.