The 'hair in the projector gate' gag was so realistic, many projectionists attempted to remove the hair themselves, not realizing it was part of the cartoon. As such, the distributors took to including a warning label on the film's canister to alert projectionists of the gag and how it was an intended part of the film.
In 1993, Magical Maestro was selected for preservation in the United States National Film Registry by the Library of Congress as being "culturally, historically, or aesthetically significant", making it the only Tex Avery cartoon to be inducted.
The name 'Poochini' is a play on Giacomo Puccini, an Italian opera composer of the late 1800's and early 1900's.
Magical Maestro (1952) and Doggone Tired (1949) have same short musical connection. In Doggone Tired the music is heard as the dog, Speedy points out a rabbit hole, with a dance. In Magical Maestro, the musical rhythm is heard when the magical maestro does a quick dance, before asking the tenor, Now, do I get the job?
A similar plotline would be used in the 1964 Tom and Jerry short "The Cat Above and the Mouse Below." Tom tries to sing opera but is thwarted by his nemesis Jerry.