1st- Taupe Vans- are a kind of shoes (taupe being a beige-like color). So, the author is commenting on their outfit at the time and that those shoes were the only modern/ manufactured in this lifetime item that they were wearing. 2nd- It can be interpreted in a few ways but I think the most obvious interpretation is that there were so many unposed/ natural/candid pictures, so many that it's as if they're filling up the camera roll almost to its capacity. The phrase to "burn through" meaning to use something quickly. I hope these explanations help with the general understanding. I think it is a well written book and I like the author's way of describing the photos that they had taken.

I agree with what Sandy said. The second one, especially, is written in a sort of flowery, literary way. It's a nice passage that discusses a roll of film, intention, authenticity, and memories. And that, maybe, the best pictures on the roll aren't the contrived, staged photos but instead the unplanned, natural, spontaneous images that were haphazardly shot just to 'burn the roll.' When you see them in the future, they will cut through time and transport you back to that day in the past more so than the staged photos that directly document the actual intention of the event...i.e. everyone gathered for a group shot, smiling on cue, at a wedding/graduation/etc.

First one - the vans are the color taupe. She mentions that what she was wearing was thrifted so the items are likely old with the exception of vans which are a newer shoe brand