they got something wrong...
in the audio commentary on the new DVD, John Waters and Lewis Jackson keep referring to "Silent Night Deadly Night" as "Silent Night Bloody Night" although I assume anyone familiar with "You Better Wach Out" probably knows the difference between these other two films...
and PS at one point Waters asks Jackson if "You Better Watch Out" was known under any other title besides "Christmas Evil" and he answers no, but it was definitely known as "Terror in Toyland" at some point. perhaps as a video release?