Shared with you
Driver references the fable of The Scorpion and The Frog: a frog agrees to carry a scorpion across the river if the scorpion promises not to sting the frog; the scorpion does promise, but halfway across the river he stings the frog anyway, saying "it's my nature," and they both drown. Driver can be seen as The Frog of the story - he drives/carries criminals (scorpions) around in his car, but is inevitably dragged into their destructive world (stung) leading to everybody's downfall. Driver's jacket has a scorpion on the back, just as the frog carried the scorpion on its back.
In preparation for his role, Ryan Gosling restored the 1973 Chevy Malibu that his character uses in the film.
After Ryan Gosling and Nicolas Winding Refn removed much of the Driver's dialogue, Bryan Cranston felt that his character, Shannon, should make up for the lack of talking in the film, and thus made Shannon a motormouth. Much of his dialogue is improvised.
The Driver and Irene actually say very little to each other, primarily because Ryan Gosling and Carey Mulligan felt that their scenes should be more focused on the mood and refused to say many of the scripted lines. Mulligan summarized making the film as "staring longingly at Ryan Gosling for hours each day."
Despite the driving storyline, director Nicolas Winding Refn has no interest in cars. He doesn't have a driver's license and has failed his drivers test eight times.