You put it on there I am going to grill you on it ...
you put it on there, expect it to be challenged on it, putting something on your resume is a invitation to be asked about it in detail.
Plain and simple, don't put anything that isn't relevant on your resume.
No matter how much you think it will add, if I didn't mention it in the requirements I don't care about it.
Fail a simple question about something and you fail the entire interview
If you put something on there as filler, and I ask you a simple question on it and and you fail, I probably won't even ask you about the relevant stuff figuring you have already wasted my time with mis-representation already.
This has been covered ad-nasuem on this site, the internet and well before the internet in books about resume writing.
It should be common knowledge/sense by now that you only put what is relevant and be as specific and brief about how it is relevant to the position, anything else will be ignored or worse count against you.
Put yourself in the position of reviewing, hundreds of resumes for a single position, and then read your resume, you have about 15 - 30 seconds to make the cut to get into the will consider pile.