When Gioia remembers breaking of the doll at the end of the movie, it's different than the first time it's shown. Wig is also added to the shot.
When Tony is making out Susan while Gioia is going to the upper floor, their position shows discontinuity in the following shots.
During the photo-shoot scene, the photographer snaps away with his old-style Nikon camera without a winder. Without winding the film forward between photos. Also, there are no flashlights present, and the ambient light is way too weak to produce a usable image on film.
When Susan falls on Gioia, it's obvious that she had to fall from a standing position or be pushed. She can also be seen breathing.
Kim can be seen moving when found dead in the container.