Some people may not know there's an Alien (Xenomorph) on the official Iron Maiden flag for The Number of the Beast. It doesn't show up on the cover of the CD (and possibly not on the LP either, I don't have that so I can't check).
(sorry for the shaky-cam)
Never uploaded a vid straight to the blog before (I think) so I didn't know the quality would be reduced. Here it is from Youtube: