Many of Russian inscriptions, including chat messages and bilingual closing credits, apparently were translated via online translators because some of them make zero sense to those who are fluent in Russian. One of many examples: composer's name (which is Crystal) was translated not as a person's name but as an adjective.
During the scene in the plane the group is watching the film Escape Room (2017), which was directed, produced and written by Will Wernick who is also the director, producer and writer of this film.
Also called "No Escape" on hulu.
EASTER EGG: Whilst Cole (Keegan Allen) is scrolling through his UPic followers, director Will Wernick's name can be seen as a subscriber.
The name of the fictional airline that flies the main protagonists to Moscow is "Delson Air" which is a reference to several of the movie's ([co-]executive) producers whose last name is "Delson".