I've heard recently about the excellent job Canada seems to be doing teaching "media awareness" to kids

I don't know how excellent a job we're doing, but here's an example: there's a hilarious ad on TV about house-hippos, done as a nature show vignette, complete with very cute graphics. At the end, the narrator reminds us viewers to question what we see on TV, since it often looks believable, even when we know it probably can't be true.