> and you were well known to be a slacker? > what classes of problem

If people are going to lie on their resume there isn't a whole lot of anything you can do to fix that at the resume evaluation level. So many resumes have 100x skills where they say they know some language because they happen to walk by a room where someone might have been looking at the wikipedia page describing someone who might have used the language once accidentally.

If you can't relate the impact / accomplishment of the candidate for your job to your company,then that just speaks to a low quality resume. It should be obvious to any reviewer why what you did is relevant to their interest.

The reason why impact matters is that in some sense it should be theoretically reproducible. "Saved 100s of engineering hours by fixing some nonsense" which if true should speak to someone who can ostensibly save time while also understand the meaning of their work.