Abagnale says himself that "Catch Me If You Can" is mostly fiction:
> I was interviewed by the co-writer only about four times. I believe he did a great job of telling the story, but he also over dramatized and exaggerated some of the story. That was his style and what the editor wanted.
ETA: It's not like the version on his website is likely true either, just saying that questions about the veracity of the story have been around for a very long time and have been strong enough that he's backed away from a lot of the claims in the book.