Like Tomas, I had a tough time getting past that Disney channel music. At least the embarrassment was tempered by my listening through phones. I got through the first video and most of the third. The mixing tips on the third video were almost too subjective for me. I could hear what balance issue he was raising about the guitar and the lead vocal, but couldn't hear the differences he was attempting to point out with the other instrument combinations. The whole mix also sounded too compressed to me. At least for me, mixing for ambient differs quite a bit from what he was doing. I prefer a more open approach to the overall soundscape. That scape might eventually build to a sound wall or a crescendo, but the mix ebbs and flows and is rarely a static thing for me. Because of that, I prefer not to have my instruments "sit in the mix" as they might in a pop song.
The videos are good food for thought, though! My first reaction to those lava lamps in the background was, "stoner alert!"