"Extra goodies" refers to additional or extra things that are usually seen as a bonus or something that brings extra enjoyment or value. Full definition
If you install this custom ROM on your device, then you will get tons of extra goodies besides all the stock Android 6.0 features. (android.gs)
What I like most about smoothie bowls is they are topped with extra goodies like fruits, nuts, seeds, coconut flakes, granola, etc.. (simplenaturalnutrition.com)
I've also included a few extra goodies for holidays and coloring purposes. (tes.com)