These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
I Am Not Shazam: There is nobody named "Eraserhead" in this movie. Despite what you might think, the title doesn't refer to Henry's haircut, it refers to a scene in the movie where somebody makes pencils out of his severed head. It Makes Just As Much Sense In Context.
Squick: See Nightmare Fuel and add the worms (quite possibly giant sperm) that are everywhere.
They may symbolize giant sperm, but they are umbilical cords swiped out of a hospital dumpster. One assistant stepped on one accidentally and was so disgusted that she quit the whole production.
Another interpretation is that the worms are developing foetuses of monster-children much like the baby Henry and Mary already produced.
