(Since we are just observing for now, I'm trying to stay away from analysis without delving too far into interpretation.)
Everything, even on the surface, has a slightly sinister air. Example: what is at first a somewhat cheery tune (Blue Velvet - how many times do you think this is played, honestly?) has this disturbing minor chord at the end when Dorothy sings it. Even the ordinary is tinged with sleaze and danger in the world that David Lynch creates for us with Blue Velvet. Miku and several others pointed out the writhing insects in the opening scene. Again, Blue Velvet is about the dark, the unsettling, the filthy ugly underbelly of the normal green suburban lawn, of our entire normal green suburban existences. Brandi touched on this as well. (I really need to start writing my blogs earlier, because everything I have to say has probably already been posted.) The film makes us question the concept of "normal," of how 'regular' or 'ordinary' anything really is once we look underneath its surface. And in the very first shot after the opening credits, the camera moves downwards, from the blue sky to the white picket fence to the bright red flowers to the green grass below. We haven't gone under the surface yet, but we're looking more closely already. Actually, this might be a stretch, but I think even the opening credits show this concept. The blue velvet fabric is moving eerily, ever so slightly behind the names. Something underneath has to be moving it- perhaps wind, or something otherworldly - but under the sheen of the material there is something bigger at play, just as we've discussed. I really (not) eloquently pointed out in my previous post that Frank is such a classic deviant in every way. "I'll fuck anything that mooooooves!" I guess this is a less-subtle example of this very ordinary-looking man being such an insane, psychologically twisted character once we begin to examine him.
And as for my title, Sandy says that towards the middle of the film, and I think it's pretty apt given the film's general theme: that once we look closer, underneath the surface, things really do get very, very strange.