For a quick sequence where we see a close up of Bugs' hands massaging Elmer's scalp to the notes of a short piano solo in the opera, they are deliberately drawn with five fingers for the sequence so they can believably follow the tune.

A signboard lists the opera's featured cast as Eduardo Selzeri, Michele Maltese and Carlo Jonzi, references to Edward Selzer, Michael Maltese and Chuck Jones, their names appear in Italian dialect, and are then transferred to English.

Was originally pitched as a Bugs Bunny/Elmer Fudd pairing set in a barber shop, with no singing, but it was decided it would be funnier if it was a spoof of the classic opera "The Barber of Seville".

In author Jerry Beck's 1994 poll of animators, film historians and directors, "Rabbit of Seville" was ranked #12 among the 50 greatest short cartoons of all time.

The title of the cartoon is a play on words for "The Barber of Seville, or The Useless Precaution", an opera buffa in two acts by Gioachino Rossini with a libretto by Cesare Sterbini. The première took place on Wednesday 20 February 1816 at the Teatro Argentina, Rome.

In this short, Mel Blanc as Bugs Bunny did not say his trademark quote of, "Eh, what's up doc?"

The voice of Elmer Fudd--performed by Arthur Q. Bryan--is heard only twice in the film: his painful reactions when Bugs Bunny "shaves" him, and when he sings "Oh, wait 'til I get that wabbit!" afterwards. Bryan was a fine singer but rarely got to display this talent playing Fudd in the Warner Bros. cartoons. What's Opera, Doc? (1957) was a memorable exception.

The Figaro Fertilizer that Bugs puts on Elmer's head in his second time in the chair is a play on both Vigoro plant fertilizers (thus the flowers that grow out of Elmer's scalp) and fact that Figaro is the Barber of Seville's name in the opera.