Plot hole: Dr. Phibes kills Dr. Hargreaves at a costume ball by crushing his head inside a frog mask. But one of the plot's main points is that Dr. Phibes is presumed dead following the car crash in Switzerland many years ago. So whose house is the costume ball at? If Phibes is presumed dead by all his friends and colleagues, why would they show up to a party at his house? Or did Phibes simply crash someone else's party, knowing (or hoping) that Dr. Hargreaves would be there?
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