if you do work that is all knit on both sides (and purl on both sides for that matter) you are going to see the "bumps" only. This is called garter stitch.
The piece she has in the knit video is done a row of knit and a row of purl alternating...this is Stockinette stitch.
before you do a project in all stockinette stitch (Like a scarf) check out the sticky thread at the top of this page to get some tips to keep it from curling.
congratulations on getting yourself into a VERY addictive habit...you will find plenty of enablers here!