That's probably a big one though I'd guess the biggest would be the double data entry, where you're asked to provide a resume (usually in Microsoft Word format)

That's probably a big one though I'd guess the biggest would be the double data entry, where you're asked to provide a resume (usually in Microsoft Word format) and then enter all of that information again, broken up into dozens and dozens of poorly designed textboxes. It really is a huge middle finger to applicants and makes clear that the company believes your time does not have value.