They didn't use the flash, they used HDR and no HDR, the non-HDR ones were darker and pretty much overall worse. I move all my pictures to my SD card in a specific folder depending on what the image is of.
And I don't have flash or a flashlight on my tablet, so 😛
And I kind of mixed it up, instead of consistently putting HDR on the top and non on the bottom, I accidentally mixed it up a few times, although you can probably tell which one is which.
(if you couldn't tell, I like HDR, except for that it lags a lot after you take a picture, and you can't hold down the camera button to take multiple pictures and make an animation, and I don't think you can even take HDR video, because I tried it with and without and they looked the same.)