Here's a random (and possibly not entirely original) thought: actual deliveries might be moderately higher than 24,500. I know Drivin just read this first line and clicked the "Funny" button, but for the rest of you read on...
First, the 1% error language - which has been in every deliveries release since forever - was notably absent. I think we can all agree, therefore, that the door is open for the 24,500 number to be off by over 1%. By the way, 1% of 24,500 is a pretty significant number when you consider how close Tesla is to profitability this quarter. Also, 24,500 is a suspiciously round number.
Second, there's new language about the deliveries count being "slightly conservative." Taken at face value, a normal reading of this language suggests that the (possibly in excess of 1%) error would be to the low side, meaning 24,500 should be a baseline.
Third, we know Elon caught wind of some OAs trying to complete paperwork before actual delivery took place and wrote a very public letter explaining that delivery + paperwork was required for a delivery to count as a delivery. I'm quite positive this contributed to the conservatism in the release.
Fourth, we know Elon vowed to "personally review" the deliveries list and for Tesla Finance to deliver a report to him re: discounts/reasoning for every one. I think we can agree this probably wasn't completed by early Sunday when the numbers came out. Thus, the 24,500 deliveries number must not include corner cases at all, or else there's serious egg on Elon's face if the actual number was something like 24,000 because 500 cars had "early paperwork" or whatever. See also: language re: "conservative."
How could this have been done in practice? Here's one possibility - what if the 24,500 number didn't include any paperwork/deliveries submitted after the date of the email (Sept 28) because it needed to be vetted to make sure they don't overreport after hearing of potential early paperwork issues?
Elon has laid the groundwork for reporting back on that companywide email and has every incentive to do so. He mentioned a personal review, noted that he expected a small number of cases (re: discounting specifically, but still) and posted the thing to Twitter. The number one bear response to the great numbers were "yea, but discounting" and "you are inflating the numbers!!1!" He left himself a clear opening to post back to Twitter: "Review completed, improper discounts of new cars only 0.x% of total deliveries. Paperwork only submitted early in ___ cases. Actual deliveries were _______, not 24,500."
Elon is pretty good about reporting back on investigations, especially when the subject is Tesla's integrity. I expect some kind of public follow-up on that companywide email.