lets start with some thing easythis is not really a glitch but in portal 2 if you do sv_cheats 1 then do noclip on the final boss you can find a lot of things like the earth
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See Some Examples
if you want you can view a+start's channel ps he is a really cool youtuber for glitches i will use some from him an other youtubers credit to a+start and other youtubers