I believe the small x's you are referring to on the approach planviews are non-compulsory airspace fixes. Usually a fix where theres a dog leg or 2 routes come together to join a course to a fix. I guess if the x's were along a published course, thats what they were. If you are talking about the symbols that look like a plus sign with a line under it (+) and they are out by themselves, those are obstacles of unverified height.

The red MORAs are MORAs that are above 14,000 feet. Green MORAs are anything below 14,000 feet.

Hope the interview went ok. Just curious, where was the interview at?