* AlternativeCharacterInterpretation: Is Henry a put upon man, a neurotic womanizer, or, indeed, completely insane?
* BigLippedAlligatorMoment: Two major scenes in the movie could either be this or [[RuleOfSymbolism subtle touches of symbolism]].
** The twenty or so minutes of deleted scenes from the original print (now lost) were supposedly cut for being ''too much'' BLAM...
* EarWorm: The "Lady in the Radiator" scene. Among other kinds of worm.
* EnsembleDarkhorse: The Baby.
** The Lady in the Radiator.
* EveryoneIsJesusInPurgatory: Henry's world certainly feels like purgatory.
* FauxSymbolism: Several scenes in this movie could be either very, very surreal touches of symbolism or a random BigLippedAlligatorMoment.
** Some notice it's just one huge metaphor for marriage and commitment.
** Or guilt and suicide.
** Or abortion.
* FreudWasRight
* IAmNotShazam: There is nobody named "Eraserhead" in this movie. Despite what you might think, the title doesn't refer to Henry's haircut, [[spoiler: it refers to a scene in the movie where somebody makes pencils out of his severed head]]. ItMakesJustAsMuchSenseInContext.
* NightmareFuel: It's Creator/DavidLynch, what do you expect?
* NauseaFuel: '''The Baby'''.
* {{Squick}}: See NightmareFuel 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 fetuses of monster-children much like the baby Henry and Mary already produced.
* TrueArtIsIncomprehensible
* TheWoobie: Henry, Paul, and The Baby.
* UglyCute: The Baby.
** And the Lady in the Radiator.
* WhatDoYouMeanItWasntMadeOnDrugs: It wasn't. David Lynch doesn't need drugs.
** Apparently there was an interview where he was asked if he took drugs. Lynch said "Yes, I eat huge amounts of sugar" and there was a long silence.
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