Dwayne Johnson and Kevin Hart formed a friendship since this film came out and have been best friends ever since.
Dwayne Johnson wears a fanny pack throughout the movie and the film makes multiple comedic references to it. This is a reference to a popular meme, which shows Johnson wearing a fanny pack in the '90s.
Dwayne Johnson gives three nods to Bruce Lee: yellow and black sneakers, a famous Lee pose, and a one inch punch.
From the time when Bob Stone ordered the Uber to it getting to Calvin Joyner's job took exactly six minutes.
When Kevin Hart and Dwayne Johnson's characters first meet, Hart makes a reference to Johnson looking like Hercules. Johnson played the titular character in Hercules: Il guerriero (2014).