TLDR
If you have so much as read the wikipedia page on Anna don't bother. This poorly execute adaptation fails on almost every level.
If this is you first exposure to the Anna story the real life events might make for a premise novel enough to carry you through, but make sure you at least read the wikipedia article.
Yes, creative teams quite literally have the right to take license with the source material, but the real crime here is that every time they do so they make the film profoundly Less in every way that is good while profoundly More in every way that is bad.
This compound failure - omitting or debilitating valuable source material then adding adding nonsense and drivel in its place - is the through-line of this production.
This is particularly damning in what is clearly The Vested Interest of "Inventing Anna" and the thing that a biopic should be particularly suited for: humanizing Anna Delvey.
"Inventing Anna" clearly wants us to be more sympathetic to Anna. I think this is starkly evident even if you know nothing about original events, but it is unmissable if you are mildly familiar with the particulars. I mean it goes to the ends salaciously and fallaciously demonizing her victims as elites who had it coming (even when they weren't) and trivializing the wrongs they suffered (even when rectifying them was a life upending ordeal).
Yet, the exact thing that makes this so unwatchable, that makes this famous con artist so unconvincing, that makes this put upon young woman so completely despised, is the effort to make her more interesting, dramatic and sympathetic.
If you want drama, nuance, detail, depth, competence or sympathy regarding the Anna Delvey story stick to your newsfeed>