The interior scenes of the individual apartments in the building have fenestration (the pattern of exterior openings and windows) that not only not match the other apartments' fenestration, but also do not match that of the exterior shot of the building at the beginning of the episode.
When Goren and Eames are interviewing Darla in the interrogation room, the high angle photo of her husband's legs and birthmark is different than the one previously shown. This photo doesn't show her husband's black underwear, but all other times, the viewer sees the underwear when the detectives show or look at the photo.