I just had an interesting case where Hilton posted 16656 points to my account on a bill of 1514€ (excluding tourist tax) - this already included the gold bonus + 2000 promo points. Normally I don't really check whether the amount of points is correct but this way way off, since I got just 8142 base points, which would indicate a spend of 814 USD. Even if I accounted for possible unfavorable exchange rate, and deducted 10% VAT, it was way too little points. Just the room rate itself was 950€ and then there were hundreds of euros of F&B spending.
I contacted Hilton Honors support via an email. I'm impressed with the speed of service - I wrote to them at 10:30, and they solved the case and fixed the credit around 18:30 (we exchanged one more email in between, as they asked for the receipts).
I ended up earning 36348 points (of which 19082 are base points). That means I would lose almost 20k points if I didn't notice the discrepancy... Pretty brutal if you ask me and it makes me wonder how many times something like this happened before.