However, the spirits of Sylvester's nine lives (plus 9 more) ascend and soar around him, each with a numeral on its back, singing the sextet from Lucia di Lammermoor.

[4] Back Alley Oproar is a remake of Notes to You (1941), a Looney Tunes short that was also directed by Freleng.

Back Alley Oproar is one of the few entries in which Sylvester "wins out" over another character, albeit at the presumed cost of his life.

[5] Back Alley Oproar was remade by Freleng in 1967 for The Inspector series as Le Quiet Squad.

Greg Ford calls this cartoon "Sylvester's finest hour", writing, "Back Alley Oproar's Sylvester exudes enormous appeal as he tunefully harasses Fudd, his merry medley aided and abetted by Carl Stalling's score, Mel Blanc's virtuosic vocalizations, and Freling's A-list animation team, here led by song-and-dance impresario Gerry Chiniquy.