Unforeseen - S6-E6
Continuity mistake: Maggie chases and isolates one of the terrorists holding a cylinder of toxic gas. The terrorist pulls down his gas mask to speak to Maggie, but in the following few scenes, the mask moves from below his chin to all the way back in place.
Factual error: The Saturn in the show is an Ion which stopped production in March of 2007. Therefore, it couldn't be a silver 2009 Saturn they were looking for.
All the Rage - S6-E1
Continuity mistake: The team is moving into an industrial space where they believe the perpetrator is hiding. There is a generator outside with a red power cord leading under the door they are about to breach. When they burst through the door, the cord is no longer there but it can be seen a few seconds later, but now it is black.
God Complex - S5-E23
Continuity mistake: The chase scene when Maggie, Tiff, and A are chasing the suspect is a total mess. Maggie radios in to say "he ran down the subway", but he doesn't and they pursue him in the streets. Almost immediately, the suspect hijacks a car three blocks away. They locate him in Queens, but now it's night and raining. However, when the chase began, it was bright daylight and clear. Maggie chases him into a crypt, and in the last scene, daylight is shining through a window.
Character mistake: OA says that Vickers went to Erasmus University Amsterdam, but the Erasmus University is in Rotterdam not Amsterdam. (00:07:03)
Visible crew/equipment: When the team of Special Agents are at the auto shop in Red Hook, just as Scola says, "Ethan Chen, you're under arrest," there's a visible pink nylon T-marker on the sidewalk. (00:20:15)
Prodigal Son - S5-E3
Visible crew/equipment: After Agent Hobbs reads the text that Zack sent to Clayton, Jubal tells ADIC Reynolds they need to evacuate Chapman, and in the next shot facing Reynolds there's an orange T-mark taped to the floor behind him. (00:19:35)
Continuity mistake: Early in the show when Vince is driving to the hospital after he is wounded by gunfire, he gets out of the car twice.