Safe Haven book and movie differences?

[GraceSample]

So I'm reading the book Safe Haven by Nicholas Sparks and my friend in me are going to see the movie tomorrow. I wish I had time to finish it before I see the movie but plans were already made! I was curious if there were any big differences between the two because I hate it when they do that! So yah if I could just get some answers on the differences as long as not to much is spoiled. I'm halfway through the book btw.