Violet, distraught and crying, approaches a door and repeatedly bangs on it. No sound other than Violet weeping (itself obviously dubbed) can be heard.
Boom mic visible
When Bellocq is posing Hattie on the chaise lounge, the boom mic dips into the screen above them.
Violet is shown completely nude when lying on the sofa but when she sits up she is wearing panties.
Crew or equipment visible
After Violet stands up from trying to have her nude picture taken a man can be seen in the reflective part of the camera.
Violet is wearing a thong (the straps are visible) when she flounces out of the room where Bellocq had posed her naked on the couch.
When Nell takes a customer upstairs to "view" Violet in the bathroom she tells him that she is a virgin.pure as the driven snow. Violet had already lost her virginity in an earlier scene. This may have been a deliberate lie but the customer would have soon found out.
In one scene, Violet holds a plastic doll as opposed to a composite one. Plastic dolls weren't available until the late 1940s.
In the final scene, E.J. Bellocq pictures Violet with a Kodak No. 2 Portrait Brownie, which wasn't available until 1929.