Here's how to get to the back of the cabin in the basement. Remember to save before doing this as you cannot get out of there once you get down from the roof.
Step 1: Go to this shack with skeletons in it, then stand on the top of those three boxes
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Step 2: Jump to the corner on the left side, then spam jump while holding W. Keep doing it until you glitch out to the roof
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Step 3: Voila! Just go around the cabin to see the scene from another window
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I haven't found a glitch to get inside the cabin as its walls are solid.