decaying bodies (spoliers!!)
When Donald's Mother passes away of natural causes he keeps her body and since the film lasts 7-10 days in real time the decaying corpse must surely begin to reek. (The other 3 bodies have been burnt to a crisp so they probably won't smell as bad).
Despite this none of the girls that enter the house seem to pick up on it. Can anyone suggest why.
"For God sakes, buy a better suit, you can come in here dressed like that"