I actually have a comment on this! I order fast food all the time in the UK (less so recently but that's a different story), and I haven't had a wrong order for literally several years! My wife is working in the US atm, and gets wrong orders from fast food regularly. We order stuff pretty much the same way, but it's very clear that there's some kind of operational difference in the US that's leading to a much, much higher error rate, including her being given entirely the wrong order occasionally. I think somehow the US doing more takeout and less delivery, particularly via drive-thrus factors into this.
But I might be absolutely talking nonsense.