I enjoyed playing with the map. For the most part, there weren't too many surprises. One might expect that folks would tend to move from colder to warmer and from "rust" belt to sun belt, given the opportunity. The major "surprises" like California weren't really a surprise to me as, just reading the news about crime, taxes, regulations, lack of j*b opportunities, politics, utilities, etc., could explain net movement away.
On the surface, the movement away from Hawaii (55K vs 61K) might seem strange based on Hawaii's image as Paradise (I'm sure I've done my part to enhance that image, heh, heh.) Still, as a relative new comer, there are a number of issues which the typical tourist does not see. J*b opportunities are probably key. While many j*bs in Hawaii are well paid (union effect in many cases) these j*bs don't open up very often and (as stated elsewhere) they are usually only (unofficially) available to kamaaina (primarily, those born here).
High tech j*bs are difficult to wait for. What does one do to pay the rent when waiting for a high-skill, university-degree-intensive j*b to open up? Due to many reasons, Hawaii j*bs are primarily split between "good" j*bs (full time, reasonably well paying) and "poor" j*bs (minimum wage and/or low hours - requiring 2 or 3 part time j*bs to subsist.)
Probably the second most important reason folks leave is the relatively "foreign" culture of the place. "This is the US, but it ain't America" is what I usually say to describe the culture. I personally like the culture (quite Asian but a true "fusion" in general) but it isn't for everyone. Obviously, YMMV.