Goofs

When the police are on the way to the first murder, they are driving in a 1950s boxy sedan. However, when the police arrive, they are in an early-1960s sedan.

Dr. Morton is a handed a closed manila file on the lie detector test taken by Leo Kroll and then it is open.

When Barbara is walking home from her shift at the Fun Palace arcade, she's wearing a belt she didn't have on while she was working, and her hairstyle looks different.

Lt. Frank Benson puts his pack of cigarettes into his shirt pocket twice.

(at around 54 mins) After Kroll comes back to the apartment from the nursing home, after his Mom dies from the news of her nurse being murdered, he walks into the apartment and starts smashing things after he gets off the phone. He walks into his Mother's bedroom and swipes the four pictures of himself as a child off of the fireplace mantel. There are two large porcelain figurines of a renaissance man on each side of the four pictures. He swipes the pictures and one figurine off the mantel and knocks one of the figurines off the mantel and onto the floor breaking it into pieces. Later (at around 1h 18 mins), when Lt. Benson and the others are looking over the apartment, they walk into the bedroom and there on that same fireplace mantel are the two large porcelain figurines minus the pictures.

(at around 46 mins) After Kroll has been given the polygraph test, Dr. Sanford and Lt. Benson walk out into the office and are given the results of Kroll's polygraph test in a manila folder. The man reading the test gives Lt. Benson the folder and walks away. Dr. Sanford takes the folder and files the test in the file cabinet. After he closes the file door, it is seen that the test was filed under A B instead of K (for Kroll) or D (for Dead file).

When Barbara is walking home from the arcade, a man is (apparently) following her. His shadow on the buildings, which should be due to the light from the street lamps, never changes orientation as he walks, indicating it is created by a spot light.