How to replace your Dryer power outlet 

Good video, but since you have a three conductor plus ground cable, per the NEC you are required to install a 4 prong receptacle and 4 wire cord, following the instructions on the dryer to remove the strap or wire that bonds the chassis to neutral. The 3 prong receptacle and cord is still permitted under the exception where the supply wiring had only three wires, whether that be SEU cable with two hots and a bare neutral, very old NM with a black. red and white with no ground, or two wire plus ground NM, and the practice of grounding the chassis to neutral was banned as of the 1996 NEC because it was less safe than a modern 4 wire setup with an insulated neutral and separate ground, for if the neutral were to open, corrode or otherwise develop a high resistance (aluminum wiring is notorious for such issues) the chassis can be energized to as much as 120V relative to ground, and combined with a damp basement floor, washing machine & perhaps laundry sink nearby, the dryer could be the last thing you ever touch. Be safe and follow the most recent NEC, the several hundreds of pages in a NEC code book weren't written just for the fun of it.

You used the neutral as a ground, and then grounded the box with the ground. Strange way to do it. Also, using a multimeter to check both that the power is off, and that the power is the correct voltage after you connect it would be the proper way to do it.

Are you serious? You make a better door than a window

Your picture shows you swapping from a three prong to a four prong. This video was not it.

Unless your dryer is more than 30 years old, you should have done it correctly and installed a 4 wire receptacle and changed the cord to 4 wire. Putting the ground under that screw is not legal either.

Woulda been decent if the camera wasn't jumping around, and speeding up ....Not a lotta help, really.....

do the owners of the house hear all what you are talking about?