The veteran fatty (not the poster everyone hates but the person who eats drive-thru enough to know this move), is to not pull away from the drive-thru until you have put hands and eyes on all orders and cross-checked against the physical paper receipt. It takes 60 seconds tops and saves you the trouble. 50% of the time there is an issue and you get it handled immediately. 50% of the time you have wasted 30-60 seconds of the line behind you.
But generally speaking, it's best for everyone's mental health to understand the dynamic we are dealing with and have tolerance for error. Staffing issues that cause shortage of workers, the workers who are there are either really young and inexperienced or not the sharpest of individuals, and lots of times they just don't care. As someone who worked drive-thru as a teenager, I get it. It's just a job, there is no pride of ownership or doing an amazing job unless you are a stellar teenaged individual of impeccable moral character and work ethic which I'm sure you are all and I was the exception.