It turns out that you can enable lots of experimental features in the Samsung Galery app. There you can access some checkboxes to extend a number of EXIF info shown for your images, add an additional timeline and much more. For now, none of these experimental features will change your Gallery experience a lot but Samsung may introduce new experiments at any point.
In order to enable Labs on Samsung Gallery:
- Open Settings menu
- Open About section
- Tap on the app version many times until a toast message will show-up
- Go back to settings and enter the Labs section
The "about" section is used as a place to enable debugging menus in many apps and Samsung seems to follow that pattern as well.