- Billing Displacement: Zina Bethune was actually somewhat well-known at the time, having been a child actress in The '50s and the star of a CBS Medical Drama called The Nurses that ran for a year in The '60s, so she's billed ahead of then-newcomer Harvey Keitel.
- No Budget: It was filmed over a period of about three years, on a budget of $75,000 (about half a million in today's money).
- Production Posse: The posse of Martin Scorsese began forming with this film, since he worked with Harvey Keitel, editor Thelma Schoonmaker and frequent collaborator Mardik Martin.
- Real-Life Relative: Martin Scorsese's mother Catherine plays J.R.'s mother in the opening scene, marking the first of many cameos by Scorsese's parents in his movies.
- Working Title: The initial student film version was called Bring on the Dancing Girls. The full-length version was first released as I Call First (from a Title Drop in the scene where J.R. and his buddies try to figure who'll get to be next to make out with the girl at the party). The version with the added sex scene became Who's That Knocking at My Door, then a 1970 re-release changed the title to J.R., before it reverted back to its current title.
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