Fan Nickname: While RayCrisis is the only game in the series that wasn't officially named "Layer Section" in Japan, fans sometimes refer it as Layer Section III.
R-GEAR has been dubbed by fans as "RayForce 1.5" as the only trailer for the game showcased some of the ideas that could have been implemented into this game was later used for RayStorm instead, while having the same 2D visuals of RayForce.
No Export for You: The PC ports of RayStorm and RayCrisis were released in Japan and Europe, but never to North America. Suffice to say they can run on Windows computers without having to change the regional Unicode settings of your PC, thus making them import-friendly... if you can find copies of these games in these times (especially RayCrisis).
The Simple 1500 Series Vol. 75: The Double Shooting: RayStorm × RayCrisis compilation was only released in Japan. The PlayStation Network re-release of these games also stayed there.
The PlayStation 3 version of RayStorm HD was released only in Japan.
What Could Have Been: R-GEAR, a true sequel to RayForce was originally planned until the development of RayStorm took its place.