The Troll Farmer (No. 38) - S3-E1
Continuity mistake: When Solomon forces Isabella to take a photo of her baby and send it to him, the picture she takes is different to the one he receives. Note the position of her baby's hands and stuffed Panda.
Marvin Gerard (No. 80) - S3-E2
Revealing mistake: In the scene where Solomon kills the Russian convoy driver in the hospital, there is a black computer mouse pointer visible over the HR/min on the medical equipment display. (00:22:23)
Visible crew/equipment: After Reddington warns Liz of the Wendigo, he leaves, and the camera pans out. We see the entire set: Liz on the couch, the stage with the entire set, the theater seating, camera ladders, the lighting, etc. (00:04:40)
Suggested correction: This is a theatre used for plays, and it's Red's temporary safehouse for Liz. In the previous episode, The Djinn (No. 43), Red talks about this theatre owned by Gerta. Red says, "Her theatre is ours as long as we need it." So, Red and Liz are using it to hide out.
Revealing mistake: When Tom Keen is on the phone at the end of the episode, he is holding the phone backwards with the screen away from his ear. (00:41:20)
Mr. Gregory Devry (No. 95) - S3-E11
Other mistake: After arresting the Reddington impostor, Ressler states that while hunting Red they had only one photo with a "passing resemblance to the man we've been working with." In S1E1 you can however see a high quality picture of Red on the front desk screen while he is arrested. (00:32:25)
Suggested correction: The photo that's seen on the front desk screen is the same photo on Reddington's wanted poster, which has been seen a number of times in the show. That is the 1 photo the FBI have that has a "passing resemblance" to Reddington today, which is what Ressler is referring to.
Mr. Gregory Devry (No. 95) - S3-E11
Factual error: Aram tells Elizabeth he downloaded "the fourth series of Doctor Who" and "Tom Baker is amazing" (indicating Baker is in series 4). Baker was the 4th Doctor and did not appear until series 10 of the original run.
Continuity mistake: Rachel the journalist puts on her jeans twice when speaking to Reddington.
Continuity mistake: The knife hole and blood on the envelope of the note to Scottie Hargrave changes. In the first close up, the name is aligned to the middle of the hole and there's a trail of blood running down towards the corner. In Scottie's hand, the hole/blood is higher up and the trail of blood is gone.
Alexander Kirk: Conclusion - S3-E23
Continuity mistake: When Tom Keen returns from shopping to find someone over the cot of baby Agnus, a fight breaks out, during which the camera jumps to different shots of the baby who is wrapped in a pink blanket, then no blanket, then back to wrapped in the blanket. (00:37:22 - 00:37:58)
Alexander Kirk: Conclusion - S3-E23
Factual error: Airport Abel Santamaria is not in Baracoa, but in Santa Clara. Baracoa airport's name is Gustavo Rizo.