Trivia: Co-star Pedro Pascal actually is a massive Nicolas Cage fan and was thrilled to get the part of Javi, an obsessive fan. Pascal has said that Cage wasn't nearly as weird or eccentric in real life as you might expect based on his reputation, and was totally professional every day.
Trivia: There's a subtle meta-joke in the end credits scroll. While Nicolas Cage is credited as playing "Nick Cage," the imaginary "Nicky" is credited as being played by "Nicholas Kim Coppola," which is Nicolas Cage's legal name. (He adopted "Nicolas Cage" as a stage name after his first few films.) As "Nicky" is supposed to be an imaginary representation of his younger self, they credited him as being played by Nicolas Cage's original name that he used to use before he chose his stage name.
Trivia: Nicolas Cage suggested swapping parts with Pedro Pascal at one point, and having Pascal plays the "character" of Nicolas Cage while Cage would play his biggest fan Javi. He thought it might give the movie a weird, extra-meta edge. But the idea was quickly dropped when he realised Pascal was perfect for the part of Javi.
Trivia: In the movie, all of Nicolas Cage's tattoos are hidden with makeup and his nickname is spelled "Nick" instead of the usual "Nic" to subtly indicate that while the character is indeed inspired by the real-life Nicolas Cage, it's an exaggerated "movie version" of him.
Trivia: Nicolas Cage originally didn't want to make the film, as he felt uncomfortable with the idea of playing himself in a movie. The director wrote him a very nice note, explaining why the movie was important to him and how they wanted to celebrate Cage's wild and varied career, which won Cage over.
