Someone asked earlier on the sub about bonus chapters in 'The Friend Zone' PDF they had, and I went digging because my copy from a library download was pretty basic. It didn't have any extras, just the main story. But I checked my sister's Kindle purchase from a couple years back, and hers actually had a bonus epilogue after the acknowledgments, the one where they're at the dog park a few years later.
So it seems to depend entirely on the source and the edition. The PDFs floating around on general book sites are usually just the stripped-down text. If you want the extras, you likely need the official retailer ebook, like from Amazon or Kobo. Sometimes the publisher releases special editions later with added content, but for Abby Jimenez's book, the bonus scenes were part of the initial ebook rollout. I'd be wary of any random PDF claiming to have them—it's probably just the main text.
Worth mentioning that the 'extra' most people talk about is that epilogue, but there's also a fun little recipe for those cookies that get mentioned. My copy didn't have that either, which was a bummer.