The real Martha Beck was of a very different stature to that of actress Salma Hayek and at the time of her death weighed well over 200lbs. On her execution day it was discovered that she would not fit into the electric chair so was seated on the arm rests when the fatal shock was administered.
After the police find the blood under the floor boards in Fernandez's house, we hear Hildebrandt's voice-over that the cops just missed the couple as they were 5 miles away in Seaford, NY buying a flop top car. Fernandez's home was in Valley Stream which is close to 20 miles away from Seaford, not 5 miles.
When the aircraft lands at the Albany, NY, airport, a runway sign indicating Runway 28 is seen. Albany has four runways, none of which are runway 32. The closest runway to that is runway 28.
Charles Hilderbrandt: Buster was my partner. We went all the way back to a squad car, for Christ's sake. He was the toughest badge I'd ever seen. Turn more collars than a Chinese dry cleaner.