I think this is the worst Physics video I've ever seen. I can't say whether its wrong or not (I'm not well versed in theoretical physics), but I can tell you its not at all convincing.

Stereo songs can easily be converted into mono songs, either through software or by using special headphones made for hearing impaired people. The only reason to buy the mono box would be because you're the type of audio geek who likes to hear slightly different recordings of the same songs. And that's cool. All music fans can appreciate subtle differences between performances of their favorite songs. But if this video's title had read "blown away by slightly different Beatles recording" it wouldn't have gotten any upvotes.

Also, you can cause a forked bike to jam simply by shoving a stick through the spokes.

The hyperbole used here is absurd. Even if they started with only one molecule of their homeopathic substance (and they start with much more than that), they would literally need a sphere of water the size of the distance from the earth to the sun in order to achieve the dilution that this guy claims. The amount of water actually used is shown right there in the beakers on the screen. Ignore the numbers.

EDIT: I was wrong. I thought about it some more, and I understand what's going on now. His math may well be right.