Algernon telling Sam, "We'll clean up that case of Haig & Haig later." is intended to imply they're working on an important legal case. However, it's a double entendre, as Haig & Haig is a Scottish distillery that has been making whisky since the early 1700s, and a case of Scotch contains 12 bottles.
The Rex Theatre in Spartanburg, SC, invited "Fat Folks Free" as a publicity stunt for this film. Patrons who weighed more than 225 pounds, as measured by the scales in the lobby, were admitted for free. (Spartanburg Herald, 26 January 1921)
The $5,000 check Leary receives as a retainer by the Milk Trust would equate to about $79,000 in 2024.
This film has been preserved by the Library of Congress.