The phrase "come hell or high water" typically means "do whatever needs to be done, no matter the circumstances". It also refers to the "hell or high water clause" in a contract, usually a lease, which states that the payments must continue regardless of any difficulties the paying party may encounter. Both definitions apply to different parts of the plot in this movie.
Toby offers his son a beer. Texas is one of ten states that allows underage minors to consume alcohol in specific locations, such as the privacy of home or in the presence of consenting and supervising family members.
The film is dedicated to David John Mackenzie (1929-2015) and Ursula Sybil Mackenzie (1940-2015), the parents of director David Mackenzie. Both died while he was making this film.
Comancheria, the film's original title, is the region of New Mexico, West Texas, and nearby areas occupied by the Comanche before the 1860s.
Parts of this movie were filmed at the Route 66 Casino, with the casino patrons/employees being voluntary extras.
Chris Pine, who plays the younger brother, is actually two months older than Ben Foster.
Was originally titled "COMANCHERIA" but was changed after a title competition between interns at one of the production companies. The title that won was "HELL OR HIGH WATER". However, in some countries (like Spain) the title is "Comanchería", probably because the pun within the original title does not translate properly.
The first two bank robberies take place in Archer City and Olney, Texas. These were towns used in the filming of The Last Picture Show (1971), which also starred Jeff Bridges.
Parts of Comancheria (the film's original title) are being filmed in Clovis, NM, with residents of the city being used as extras.
Second movie of 2016 starring Chris Pine and Ben Foster after The Finest Hours (2016).
Due to his tight schedule with Star Trek Beyond (2016), Chris Pine was only available for two and a half weeks, so all his scenes had to be shot very rapidly and in sequence to maintain the required level of energy.
There are several mentions of Archer City, TX, the town where The Last Picture Show (1971) was filmed, but this film was shot in New Mexico.
Taylor Sheridan's uncle, McLennan County Sheriff Parnell McNamara, served as a consultant to Jeff Bridges on the shoot. McNamara had been a U.S. Marshall for over 30 years.
Screenwriter Taylor Sheridan drew much of his inspiration from the TV miniseries Lonesome Dove (1989) having earlier read Larry McMurtry's 1985 Pulitzer Prize-winning novel on which the series was based.
Dale Dickey and Kevin Rankin, who do not share scenes in this film, also appeared in Breaking Bad (2008) where they also did not share scenes. Both works were filmed in the state of New Mexico.
Katy Mixon, who plays the waitress Jenny Ann, appeared in Blind Dating (2006) which also starred Chris Pine.
There is no mountain range in northwest Texas, even though one is clearly in the background of many scenes.
At about the 53 minute mark when they are traveling in the car, they pass a closed Shell station. Over the shop in the back you can see three signs that say Shell Travel Plaza. This is the closed Shell truckstop on US54/Bus I-40. They are heading east, on the west side of Tucumcari NM. This road is also the original Route 66.