The Frog is one of the most complex games regarding graphics and animation. We designed an animation editor for this game, where motion designers could create animation scripts from simple elements like in After Effects. So, instead of two layers (logic and graphics), there were 3 of them: logic, graphics and animation scripts.
Also, we had a problem with the massive amount of graphics resources with transparency, which was not fitting on a flash drive (at that time SSD tech was not ready yet). So we added jpeg2000 format support to keep graphics compressed. Moreover, we became a Linux compression guru; we managed to fit it in 30-50 Mb with all the required libraries and graphics subsystem.