I dropped my Mac.

Hello, let me explain: last night I dropped my Mac from a little over 60 cm, but I somewhat cushioned its fall by trying to catch it... so it fell closed and there wasn't a very hard impact. I was relieved to see that it seemed fine. Unfortunately, I just noticed while watching a video that the bottom left corner was much brighter than normal, and indeed it is. Also, usually when I turn it off, it does this weird thing where a bunch of weird pixels appear before it shuts down. Since last night, when I turn it off, a part goes completely black and the pixels stay for much longer before it shuts down... I've only had it since September, so it's still under warranty, but I would like to know if what it's doing when I turn it off is normal and if I should be worried about the brighter corner...