Actually, not to confuse matters, but if you twist the stitch the way veronika is describing, the continental purl will NOT untwist it. Wrapping backwards makes the new stitch twisted; knitting through the back loop twists the old stitch on the needle. So to compensate for twisting the stitch as veronika describes it, she'd have to purl through the back loop on the next row -- my least favorite stitch in the world!
So I would say: see if you can change the way you pick up the stitch to match Amy's video. In the long run, you'll have fewer problems matching other people's patterns.