Continuity mistake: Right at the beginning of the episode a Cadillac Escalade gets stolen. The car is the newest model. The chase begins and the car is a new model right up to a scene when they crash into some other cars. That part was filmed with older model Cadillac. The damage is quite severe, but the chase continues again with the new model that has only one bit of damage - a mirror that has come apart.
Monarch Douglas Bank (No. 112) - S2-E2
Factual error: After Red receives the package containing the tooth, it cuts to a city image that reads "Warsaw, Poland" but the city shown in this image is not Warsaw, it is actually Budapest, the capital of Hungary. This specific image shows the Széchenyi Chain Bridge (Széchenyi Lánchíd) and the Buda Castle (Budavári Palota), in Budapest. (00:06:50)
Other mistake: The license plate of the car used by Platt (93N-LI62) is the same as the one used by Charlotte Patterson in episode 13 (season 1): The Cyprus Agency. (00:01:10)
Lord Baltimore (No. 104) - S2-E1
Factual error: The RPG fired in this manner would have killed everyone in the Jeep from backblast alone, not to mention fire effects. (00:00:55)
Pattie Sue Edwards (No. 68) - S5-E15
Character mistake: When Aram wears the CDC hazmat suit, the CDC personnel advises Aram that he has 20 minutes of air to keep him alive, making the mission time critical. What she says additionally is that "oxygen levels plummet and carbon monoxide (CO) levels rise" CO is not a byproduct of human respiration - carbon dioxide is.
Factual error: The airline boarding pass from Melbourne, Australia to Zurich shows the code MLB, instead of the correct code MEL. The code MLB is for Melbourne Orlando International Airport in Florida. (00:58:40)
Other mistake: The doctor is supposedly being led away in handcuffs, but isn't handcuffed when an explosion goes off behind them and they are thrown to the ground. (00:37:30)
Factual error: When the criminals jump into old Jeep Cherokee, the car interior is a Chevrolet Tahoe, and from the outside when driving backwards, the trim is for a Dodge Charger.
Continuity mistake: The clock in the hotel initially reads 9:21 and then abruptly changes to 9:20. (00:19:48)
Factual error: Truro, Nova Scotia is not on the shoreline of Nova Scotia, but is in the middle of the peninsula.
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)
Factual error: The grave stone in the cemetery shows the deceased rank as 1st Lieutenant, but the branch of service is U.S. Navy. There is no such rank in the Navy. The rank for an officer 02 is Lieutenant Junior Grade - Lt.Jg.
Character mistake: After the seaplane crash lands off the coast of Havana, Elizabeth radios a mayday. However, she broadcasts nonsensical coordinates. The first set she provides is 23°52' north, the second set 82°49' south. These combined coordinates can't possibly plot to any location on earth. The more probable coordinates should've been 23°52' north, 82°49' west. These coordinates would put the plane roughly 57 miles NNW of Havana, Cuba. (00:05:48)
The Architect (No. 107) - S4-E14
Revealing mistake: Aram Mojtabai fires a high-caliber weapon, destroying a vehicle with it. But after the weapon is fired, the projectile is still in it. Instead, the weapon's lower jaw has disappeared. (00:34:35)
Factual error: Elizabeth takes a look at one of the passports, which on the outside is Swiss but the info on the inside corresponds to that of a German passport. (00:43:25)
Character mistake: Tom's toe tag says that he was 33 at the time of death. In the next episode, Ruin, his Tombstone says he lived from 1985 to 2017, making him 32 at the time of death. (00:41:55)
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)
Abraham Stern (No. 100) - S5-E11
Continuity mistake: In the beginning of the episode, Reddington is in a Mercedes S-Class driven by Dembe. This specific car model is mainly used by Reddington in his travels. The car is a 2013 W222 Mercedes S-Class. The interior is also depictive of the specific model W222. Suddenly, he gets into a car accident where the Mercedes he is in is not a W222 but a W221, an older model from 2006 to 2013. (00:00:08 - 01:10:00)
Helen Maghi (No. 172) - S9-E16
Factual error: Harold tells Raymond he'll repay the bail money, but given he's pleading guilty and fully intends to go along with required court appearances, etc, the bail money paid will be refunded - it's not like Raymond is out-of-pocket.
Revealing mistake: Aram "hacks" an employee database via a company website - the code that's briefly visible on screen (slo-mo helps but isn't required) is just standard HTML that lays out a web page, not server commands.