Continuity: In Episode 411, "Lady Killen": When Lee Scanlon is in Sensai and the janitor walks him to the kitchen, the doors are push-through doors with no handles on them and with circular windows in them. But when they walk through, the doors are not push-through any more, but have handles on the one side they opened with, and no windows.

Plot hole: In the episode "Whatever Possessed You?" Colleen's doctor tells the district attorney that her sickness doesn't follow the guidelines of normal schizophrenia in that the normal medicines don't help. This gives Allison and DeValas an opening to investigate what is causing her to be ill. Why would she give them such important information when she is in on the ruse?

Factual error: 1-11: I Married a Mind Reader. A nitpicking mistake, but on the set of "I Married a Mind Reader", the front door is a modern steel design. Back in the 60's, front doors were almost always wood (steel doors weren't available until the 1970's or 80's), and the window design would have been larger on a 1960's fan-window wooden door.

Continuity: "Heads Will Roll": When Allison meets P.D. on the sidewalk in the rain, when she gets out of her car, the windshield wipers are still running. When you see her car in the background, they are not running and she never shut them off.

Revealing: In the first scene of episode 1-15: "Penny for Your Thoughts," the clock shows an impossible configuration. The hour hand is slightly before the five, and the minute hand is between one and two. If it's about seven minutes after the hour, the hour hand should be slightly past one of the other numbers, not slightly before it.

Factual error: In the scene where the kidnapper is talking to his brother from prison, the payphone cord is too long for a prison payphone. Prisons use a short cord to prevent inmates from strangling someone.

Continuity: In Episode "1-900-LUCKY": When Allison and Michael are sitting at the breakfast table, the orange juice carton arternates between having its cap on and off, depending on the angle of the camera.