Bottle Cap Discs
If you ever took a peek under the soda bottle cap, you might have found that plastic disc. Although it looks unnecessary, it helps with the carbonation. We would not delve into the specifics, but this feature locks in the carbon dioxide or the fizz of the soda. Your drink would not taste the same without it!

Bottle Cap Discs
Rearview Mirror Tab
When you are driving, you will be looking at the rearview mirror often. At least you should be! There is a tab at the bottom of the mirror. What is it for? Apparently, this feature allows you to change its position to prevent the headlights from messing with your vision. It deflects the light and shows you what is happening right behind you at the same time.

Rearview Mirror Tab