Starring: Nathan Fillion, Richard T. Jones, Alyssa Diaz, Titus Makin Jr.
Revelations - S3-E6
Character mistake: The chemical structure that Lucy has to draw is structurally wrong in multiple ways. The hexagon that has the "OH" should have more bonds in it, and they failed to connect the carbon bonded to the nitrogen to the correct part of the carbon ring.
Character mistake: When the sergeant's partner gets shot and Chen calls it in, she says he got away in a black Buick, but the car was a Honda Civic. (00:10:52)
Revelations - S3-E6
Continuity mistake: When Tim puts Lucy in the squad car after "arresting" her, the rear door on the driver side is open, but when the camera pans back to her it's suddenly closed without making a sound.
The Choice - S5-E4
Trivia: We see Bailey and her team of firefighters arrive at the house on Engine 118, which is the same engine that Captain Nash is in charge of on 9-1-1, also set in Los Angeles.
Answer: Window tool.