Ryan Gosling and Chris Evans were both encouraged to improvise their lines. Their first character face to face meeting was completely improvised.
On Chris Evans' first day of filming, he accidentally hit Ryan Gosling in the face with his prop gun.
Six (Ryan Gosling) has a tattoo of a woman on his chest, over his heart. The fake tattoo is actually of Gosling's real life wife, Eva Mendes.
The movie's $200 million budget makes it, as of 2022, the most expensive Netflix original movie, tied with Red Notice (2021). The Irishman (2019) was rumored to have cost as much as $250 million, but most sources reported its budget was $159 million.