Factual error: When printing the image of the painting, Stella uses the printer driver "Microsoft XPS Document Writer" - which would save the output to a file. However, she still gets a printout from the printer in the office. (00:02:30)
Continuity mistake: Stella is talking with Jim Burns at his home about her theory of a delay between murders, and why Paul took so long to strangle his victim. During most of the scene Jim's hair is parted on the left. At the end, as she is leaving, it is on the right.