Revealing mistake: When Bella Donna is preparing to shoot a blast of energy at Rogue, her body passes through the left hand of the man on her left that was holding her back. Half of her cloak then disappears as she strides forward. (00:14:42)
Continuity mistake: When the External selects Bobby to be the chosen one for the Guild of Thieves, she turns his jacket red and his gloves gray and fingerless. When he is shown again a few shots later, his jacket is now green, and his gloves are brown, with only the thumbs being fingerless. (00:06:53)
Continuity mistake: When Gambit is saying "You got me in the guild, Bobby," you can see on the wall across the hall that there is a switch that is the same red color as the wall. A few shots later, the switch is now gray. (00:10:18)
Continuity mistake: When Jubilee is heading to the store, the driveway of the mansion is shown to have a roundabout by the front door, and a small path leading to the front gate. However, the previous episode 'Til Death Do Us Part: Part 1 showed the driveway was a winding path longer than what is shown here, and there was also no roundabout. (00:06:04)
Continuity mistake: When Xavier and Magneto are trying to escape from Vertigo, Xavier cuts the ropes of the bridge they are on, leading him and Magneto to swing into the cliff wall and hop down safely to a ledge below. When they look back up at Vertigo, she is at roughly their 10 o'clock, with the other side of the bridge by her feet. Considering that they just dropped down onto the ledge and have only moved a couple steps to their left, the other side of the bridge should still be directly across from them. (00:15:45)
Chosen answer: It says MPO "First Exemplary Printing House" which is a real printing company in Russia founded by Ivan Dmitrievich Sytin in 1889. There seems to be something about "named after..." as well.
Sierra1 ★