My favorite behind the scenes trivia for this: Gosling and McAdams apparently hated each other on set, got into some squabbles and would storm off the set sometimes. But they had obvious sexual chemistry, like really obvious; their hips are practically twitching for each other in some scenes. Months after the shooting was over and they were promoting the movie, apparently they just acknowledged they had the hots for each other and became an item for a while. Its like when two kids have crushes for each other and pretend they hate each other cuz they cant admit it.