When the detectives first see the male victim's body there is tape on the floor in the usual 'body outline' manner. Unfortunately the blood from the body is on top of the tape instead of under it.
The crime lab says there are two distinct sets of fingerprints on the shotgun that killed the couple, the husband's and the younger son's. However, Det. Profaci handled the gun in the opening scene, and his prints should be on the stock and the slide rack. No mention is made of a third set of prints.
The supposedly Russian Osinskis speak Russian with non-Russian accents and mispronunciations.