The chemistry between Rachel McAdams and Ryan Gosling is undeniable in the film adaption of Nicholas Sparks' "The Notebook."

It's one reason fans keep rooting for the two to have a "happily ever after" relationship in real life. But it wasn't always so happy between the two. In an interview with VH1, director Nick Cassavetes said the two actually did not like each other at the beginning.

"They were really not getting along one day on set," he said. "Really not. And Ryan came to me, and there's 150 people standing in this big scene, and he says, 'Nick come here.' And he's doing a scene with Rachel and he says, 'Would you take her out of here and bring in another actress to read of camera with me?' I said, 'What?' He says, 'I can't. I can't do it with her. I'm just not getting anything from this.'"

Gosling didn't think the two had very much chemistry, and he didn't think he could fake it.

Cassavetes had a solution, though.

"We went into a room with a producer; they started screaming and yelling at each other," he said. "I walked out. At that point I was smoking cigarettes. I smoked a cigarette and everybody came out like, 'All right let's do this.' And it got better after that, you know? They had it out... I think Ryan respected her for standing up for her character and Rachel was happy to get that out in the open."

The rest of the film went better, though it wasn't without its problems.

For example, the bird scene almost didn't happen because trainers said it wasn't possible. Also, James Garner, who played the older version of Gosling's character, was not interested in bonding with castmates, so when Gosling told him that the two had different eye colors, Garner didn't even feign interest.

"[Ryan] says, 'Okay, I guess I'll wear contacts. What about hair?' And he says, 'Do whatever you want, kid. Nice to meet you. See you later,'" said Cassavetes. "Ryan looked at me and said, 'Shut up, don't even say a word.' So that's just an example of two extremely different types of acting styles. Both are wildly successful."