There are no passenger lists for European trains. One can just go to a ticket vending machine (or any other vending place), pay cash, and nobody will know that he or she bought a train ticket. The name will probably not even be saved if you pay with credit (or debit) card, unless the person is a member of a loyalty program.
The train shown at 9 minutes in is a completely different one than the one seen at 13 minutes into the episode.
The European conductor that Reddington talks to in his cabin on the train from Vienna is clearly wearing United States Naval Aviator insignia (pilot wings), not any sort of Austrian Railways badge or logo, on the front of his work hat. This probably would have come down to the costume department picking a random badge that just looks the part for the foreign uniform in the scene.
When talking to the national security adviser, Keen says Ressler believes no one is above the law. This is clearly not the case, as Ressler overlooked Keen's crime spree of state level crimes, such as shooting an innocent police officer.
Several characters refer to Bogdan as "Kirlov" not "Krilov."