Around 4:42, Speedy is heard singing a spoof of the Mexican folk song "La cucaracha" in shaky Spanish which could be transcribed as: "La cucaracha, la cucaracha, ya no puede caminar porque no falta, porque no tiene, marihuana par fumar." This would seem to mean, "The cockroach, the cockroach, she can't walk any more because she doesn't lack, because she doesn't have, marijuana to smoke." Who came up with these illogical words and how they got the mention of marijuana past the censors would probably be a good story in itself.
The title card background is reused from the title card of "Speedy Gonzales".