Well I'm watching the film now. I'm pretty sure the disconnect between them that you are picking up on is perhaps Fe/Fi values rather than rationality and irrationality which don't really exist in a socionics sense anyway.
You mentioned something about wanting to know the types of the people from the movie "When Harry Met Sally"? I do love chick flicks and intend to watch this movie sometime within the next week so I could possibly contribute to such a discussion. Do you have any thoughts regarding their types that I might keep in mind?