You want to get on the hiring manager's good side, right? There's one common but easily avoidable mistake that candidates make, and it's one that seriously annoys those in charge of sorting through applicants. It's all about the way you save your CV.
It might sound nitpicky, but hiring managers prefer when attached CV are labelled with the applicant's name. Instead of saving and sending a file labelled "CV," give your CV a file name that has your name on it. This small move simplifies the process for hiring managers who are dealing with a slew of applications. It's not much effort for you to save your CV as "Jane Smith CV," and it's a positive first step toward pleasing the person in charge of hiring.