[1] According to Kyle Crichton's 1951 biography of the Brothers, Harpo played Watson, the hero and romantic lead who "made his entrance in a high hat, sliding down a coal chute into the basement."

[4] One account of the production claims that Dick Smith's mother visited the studio and sat down at a table during shooting, but consequently had to return the next three consecutive days for continuity's sake.

Additional funding was provided by the Marxes, cartoonist (and producer, in some sources) Alvah "Al" Posen, Nathan Sachs, and Max Lippman.

Groucho Marx wrote in his autobiography that it was "shot on the west side of New York," recalling that the Brothers were working at the Palace Theater and had to run across town to Weehawken to do a scene.

Over time, researchers and fans have pointed to numerous studios in New Jersey and New York as potential film shoot locations for Humor Risk.

Marx Brothers researcher Hector Arce has disputed this account, claiming instead that the only film print was burned (by Groucho) and the negatives were kept in Posen's closet.

[2] Silent short films of this era were often sold to distributors as part of a larger set, and Humor Risk was billed in the press as the first of a series titled "Comedies Without Custard".