Miami HeraldBill Cosford
Before it's done, Hello Mary Lou has touched most of the bases, flirting with taboos (incest, locker-room lesbianism, fingernails on the blackboard) and purloining effects from the Nightmare on Elm Street series. It's a badly made film, as awkward as can be, and long stretches of it make no sense whatsoever. Nor does it manage, as the better slasher films do, to re-create a high-school milieu of even passing authenticity. [21 Oct 1987, p.D5]