When the Police Lieutenant comes up the stairs, he bends over the railing part way to avoid bumping into camera and lighting equipment on the landing.
Helen's scar looks too fresh to be a burn scar acquired in childhood.
When Markie and Helen are arguing about Markie's real name, Terry Burnham mouths Janice Rule's lines "Understand what?" along with her in between her own before a cut to her close-up.