Based on the Belgian film De zaak Alzheimer (2003), directed by Erik Van Looy (known for El penthouse (2014) written by Carl Joos (known for Cordon (2014), De behandeling (2014) and El círculo roto (2012)).
Most panoramic El Paso skyline shots in this movie are accurate; however, the tall, white modern high rise does not exist and was inserted into the movie.
Both Liam Neeson in this movie and Guy Pearce in Amnesia (2000) wrote reminders on themselves to compensate for their loss of memory.
Aside from Hugo Marques (Harold Torres) and Guy Pearce, all the other main characters are European (mainly from the UK). No American-born actor appears in the movie.