Hi Chipp - so in your video when you're asking about the "extra piece" , what I think is happening there is that you were selecting through the hole in the front and getting the face on the back side of the solid to be selected. If you rotated around a bit at that point it would be easier to see that you had the back face selected and not a some duplicate of the front fragment... At least I think that's what's going on in your video there. That's in regard to your first video.

- Michael