Thanks for your answers.

2) and the checkerboard image test, it was in the main thread about screen issues. look at Post number 55. When you put it in landscape and have the checkerboard fill half the screen, you will see some purple columns. TBH, optical effects like this can be done with a pencil and paper too.. but I don't think they look purple-ish...Might grab my co-workers 4s and see how it looks on her phone.
Post 102 in the same thread by the same Poster (zerion) has a gradient image to look at as well.
[update]checked on my co-workers phone and she doesn't have the lines, but that's not unexpected.. different display tech.
[update2] also, if you do not zoom the checkerboard and slide it back and forth in landscape mode like you're playing arkanoid or Breakout the checkerboard itself flashes purple.. probably because of the sudden change from black to white

3) I am not sure how to do that.. I'l try google it

5) Please check the images i attached in a later post in this thread. I used screenshotmee and that is the way it appears on my screen, so I am assuming that is how it is meant to be. I assume that screenshotmee would not pick up any flaws in the screen but would rather capture what the phone is intended to render/display..right? If not, I will happily take a photo with my camera.

6) I only noticed that scratchiness when using the camera during a tour of a cave.. don't really see it in a dark closet

7) I am surprised that it says I have a 64gb.. I've double-checked and I only have a 16gb according to the settings menu.