So we never got a good raw for Akiba 4. We'll go off a 720 raw and do a normal HD and SD release, then move on to 5 and 6 which we do have good source material for. Hopefully we can catch up this week.
I notice a lot of contributions have been given to this wiki article that lists Rider references in this anime. I don't know anything about the anime/manga, but it's pretty cool to see that the author is a big Rider fan: