When they are at Vienna train station about to leave for Prague, Audrey and Morgan panic about being caught by the authorities during passport checks at the border. There are no border checks when travelling between Austria and the Czech Republic, as both countries are in the Schengen Area.
Although her character dyed her hair black within the movie, Kate McKinnon's wig is visibly separating from her temples during the closeups in her tight rope scene.
On several occasions characters reply to texts from withheld numbers. This isn't possible.
Audrey's toothbrush varies position throughout the scene in the hostel bathroom.
In one scene, five black CIA cars are travelling along an empty road towards the camera. When we cut back to the road, they are travelling away from the camera, but clearly just driving back they way they had come (i.e. in the opposite direction).
At Wien HbF (Vienna Main Train Station), the characters talk about needing new passports to travel to Prague. Both Austria and Czechia are members of the Schengen Accords and as such there are no border controls (including passport checks) between the countries.
The license plates of red tourist bus, have AU sign for Austria, with EU Flag instead of A, and EU flag.
When Morgen calls Snowden for helping them with decryption of the USB drive, Ed answers the phone pulling it downward, which would normally reject the call (also the red pictograph appears).
The opening scene is set to be happening in Vilnius, Lithuania. The car numbers are clearly not Lithuanian as well as the woman shouting in the market or the TV neither is using Lithuanian.
when in the Sheila Cafe, the blonde woman with formal hair style, her hand was stabbed by Sebastian and stuck in the table, but after that her hand are not stuck in the table, then stuck in back.
In the post Credit scene, Initially, when we first see her, Audry is wearing the Happy Birthday Tiara, but when camera next cuts to her it is gone.