Even though the special has a St. Valentine theme, it originally aired on March 13, 1983 (a Sunday), nearly a month after February 14, 1983 (a Monday).
Chlorhydris spoke of Azrael having "royal blood in his veins" -- which interestingly turns out to be true in Season 9's "Mummy Dearest" which depicts his distant ancestor, the cat pharaoh Azra.
"My Smurfy Valentine" is the debut of the evil witch Chlorhydris, a creation of Studio Peyo for the cartoon series. She will make her episodic debut in Season 3's "A Tear of a Smurf."