#1
ok, so Showbreads song Dead by Dawn is about Evil Dead...

Do you think someone who didnt know that could realize that its bout that movie?
#2
I think as soon as the person heard the lines "A chainsaw can remove a limb or act as a replacement" and "hail to the king baby" it would become pretty obvious what the song is about. That is, if the listener had already seen the movie.

Though "hail to the king baby" is from Army Of Darkness if I'm correct. So the song is about the series of movies than just the one.