Update:Global Chunk Incident. The incident is that all the chunks and objects are gone no one knows why but the reason why is because Roblox studio updated.(Later it's fixed)
Actually, I think "Sonic 3 Blue Spheres Creator" in Layer 5 is referring to another game by Vyriss of the same name which basically acted as a prototype of the Blue Spheres creator in CSS. It even had a recreation of the "NO WAY!" screen. Sadly, I think the game is no longer playable.
2:17 Back in versions before V9, a "playable" beta of S2 Sonic was unlockable by playing numbers "1, 9, 9, 2, 1, 1, 2, 4." in the sound test. It was extremely glitchy but at least you could play as that version of Sonic.
Also you forgot some things, on house, there's a bug to get to the unreachable wall over, there's after a set of doors a strange face that follows you, it doesn't have a name, also there's a hoax about sonic.exe being unlocable by beating house with a bug in the stairs, after that go through a wall then u come to act 2 we're there's a room with silent music, one fake wall later takes u to a empty hallway, then u go there and unlock him
errrrmmmm me and the squad discovered the second floor in house zone with the face that kills you!!! when will u cover that ermmmmmmmmmm!!!!!!!!!!!!!!!!!1
ermmmmmmmmmmmmmmmm!!!!!!!!!!!!!!1 In all seriousness i didnt make this iceberg and to be honest i always knew this iceberg lacked in a lot of stuff, apologies!
2:19 i played when s2 was a flex, once there was only s1 and s3 with no s2 on the character select and you'd have to type in the sonic 2 debug code to unlock him, i think he wasnt released yet because some of his sprites were buggy
4:15 AIZ rocks were moved i think during some early point in V10 testing, not V11 5:05 i think this is referring to CSS is basically a port of a engine to LUA. i have no clue