The Caller - S9-E10
Continuity mistake: At the beginning, a St Louis couple has reported their son missing. At the FBI briefing, the agents are told that the boy's mother tucked him in at 10:00pm. A few minutes later, we hear the radio call over footage of police at the home, and the dispatcher says "Last seen at 2100." That's 9:00pm, not 10:00pm. (00:03:00 - 00:05:00)
Continuity mistake: In the video of the Chicago robbery they enter the building at 08:27 according to the timecode displayed, but they exit at 15:32. Seven hours is a very long robbery.
The Inspired - S9-E2
Plot hole: At the beginning of the episode, PD let the suspect go (twin 1) because they accidentally arrested him for the crimes that his twin brother (twin 2) committed. Hotchner still wants to question twin 1, but a lawyer threatens Hotchner to not go near the wrongfully accused twin 1. However, in the previous episode, FBI and cops pursued twin 1 and twin 1 didn't pull over. It would be legal for twin 1 to be detained on a reckless driving or eluding the police charge.
Continuity mistake: While Reid's asleep in the hospital bed, Garcia places four Doctor Who figurines (one Dalek we don't see her place) on the overbed table - two Daleks, Matt Smith's Doctor, and David Tennant's Doctor. In the first shot Garcia's holding Smith's Doctor in her right hand and Tennant's Doctor in her left hand, but in the next shot those two figurines have switched hands.
Audio problem: When Tabitha gets home, she takes her boots off and as she walks into the kitchen we hear the soft, padded sound of bare feet; when she closes the fridge and walks to the window, her footsteps indicate she has her boots on again.
Continuity mistake: The unidentified subject is cutting a piece of flesh with a fork and a knife. The first shot shows him holding the fork with his left hand. His elbow is up, index finger straight, resting on the back near the head of the fork, the other four fingers wrapped around the handle. Next shot shows him elbow down, holding the fork with all his fingers wrapped around the handle.
Continuity mistake: When the thief tries to steal the truck and the owner is beating him up, the passenger window behind the driver breaks. When his daughter later gets into the truck, very briefly the window is not broken. Then the next shot shows her in the truck, the window is broken again.
Continuity mistake: When Wallace brings the snake home he takes it out of the tank and holds it. Between the constant shot changes the snake's position changes entirely.
Final Shot - S9-E3
Revealing mistake: As Reid explains human reaction time, near the end of it you can see a brunette woman get hit and fall to the ground, she hits ground with the back of her head and then, while supposedly been shot dead, moves her right hand in under her head.
Answer: "The Boogeyman", s02e06. Spoiler alert: The kid is Jeffrey Charles and at that point he had already killed 3 other kids. Jefferey basically hated and resented other kids after his mother abandoned him and his father spent a lot of time with other children because of his job. Jeffery would lure kids Into the Woods and then beat them to death with his bat just because of hate, no particular "reason." The scene you're describing, Jefferey agrees to walk Tracy home when her "buddy" leaves her (at this point the FBI announced there's a serial killer on the loose and kids should walk with a buddy). Jeffrey gets mad at Tracy for walking too slow and for complaining, and he takes a swing at her, causing her to flee Into the Woods and have Jeffery chase her.
Bishop73