Hi,
Welcome to our community! 
In which lecture are you?
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What do you mean by glittering? Is the wall material “metallic”? That’s an option in the material settings.
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Who is moving automatically? The player? If so, that’s because the ground has no friction. You could create a PhysicMaterial in your Assets folder, increase the friction and assign the material to the ground collider.
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Unity cannot handle fast moving objects well. What you could try is to select all walls and objects with colliders which are not supposed to move at all in your game. Then tick “Static” next to their name in their Inspector. Test your game again. If the issue persists, go to the Physic Settings and increase some of the iteration values slightly.
Let me know if this helped you solve the problems or if you still need help.
See also:
- Forum User Guides : How to mark a topic as solved