Beta 8 was probably more of a pre-release than a 'real' beta. A few textures fail to load 99% of the time, very occasionally the lighting in Sylvania Castle would load ridiculously bright and that's it. There's one instance of particularly poor enemy placement in Sky Fortress 2 that could be changed, but eh. It's still the full game, it works fine and like other have said the changes were only cosmetic. It's like the final is just a bug fix. Shame we've never gotten to see any older builds of either S4 Episode really. The PartnerNET and WiiWare leaks are just pre-delay release candidates too IIRC.