If the position calls for video editing capability I'd expect a good self made video. If it's just a video to show your talents\expertise I'd be ok with a simple video.
p.s. who would you rather fly with, a person who has flown a simulator for a year (design school) or a seasoned veteran who has no schooling but has flown over 5000 hours in several different aircraft.
Things every designer should know.
1. fonts - know where they reside on a pc, know which to avoid (papyrus), kerning, leading, justification, bullets, asci characters or how to find them
2. vector vs. raster - don't assume a pdf or eps is vector solely on the file extension, know how to tell the difference between a good raster image vs. a bad one
3. how to deal with multiple file formats - when and how to use them, know the file extensions, know how to unzip files,
4. Basic pc operations - how to load unload a printer, change default printer, explore files, prepping files for print, naming/renaming files, how to share folders/printers,
5. WORK ETHICS! - on time every time, get along with coworkers, proper attire (if you're working with knives - no open toed shoes)