Factual error: In a real scenario, FBI agents or specially trained individuals will only use their flashlights when they need to check something or clear an area. They then turn the flashlights off to avoid revealing their position and to maintain situational awareness. Constantly using a flashlight can compromise their position by making them an easier target. However, in the show, their flashlights seem to be on all the time.

FBI (2018)
1 factual error in show generally - chronological order
Starring: Jeremy Sisto, Missy Peregrym, Ebonee Noel, Zeeko Zaki
Undisclosed - S2-E7
Continuity mistake: Agents follow the suspect after the shooting in an apartment. They chase him upstairs and out of the door but are still at street level.
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