Email that I received this week from my partner:
"So I just realized something. I submitted a job application and I had to send a writing sample from my degree coursework. I just realized, and had to correct it before I sent out this application, that all writing samples I have sent out with job applications could have actually cost me jobs. Why? Because ALL spelling is in BRITISH English!"
When employers are swamped with job applications, yes, it can come down to details like these.
Still, it's not as good as one job application my mum received when she was hiring for a position, it stated that the applicant was qualified in "fist aid".