A title at the end of the film said, "George Nassar is still in prison in Massachusetts." The New York Times reported on March 28, 2023, that he had actually died in prison in 2018 at the age of 86.
The crime scene photos did not match the crime scene description report of the murder of Helen Blake.
When the TV set is turned on by the killer in the first victim's apartment, the picture comes on right away. In the '60s, the sound would have come on immediately, but the picture would have appeared only after several seconds, as the TV warmed up.
The handset (receiver) of Loretta's home phone clearly has a modular connector. These didn't come into use until the late 1980s.
In the 1960s (and for some time after that), touch-typing was the rule, not the exception. The women, in particular, would have had this skill. Yet Loretta and Jean don't touch-type.
Loretta McLaughlin types up her stories single-spaced. Reporters of the typewriter era would always double space their stories, in order to leave room for the copy editors to make corrections and changes.
She would also have typed "30" at the end of the article to note to the typesetter that it was the end of the article.