Okay, well I might actually be able to answer this one. Just because you have a resume doesn't mean you prepared it yourself. Many people have gotten through the doors of large corporations without reading or writing skills. There spouse helped them or they hired an agency to help prepare the document.
A resume is also a document that you had to think about and time to prepare. You can tell quite a bit about how a person works under stress by the information that put in print. You can also see any discrepancies between the two. I know that when I have handed someone a application I usually take the resume first. I also look to see if they are referring to some other cue for job information. It gives a clear indication on how much information needs to be verified on the applicant.