#2
There's no part of that vid that sounds like two guitars (except the parts with two actual guitars playing). But I think you're talking about the delay and chorus on the rhythm guy's sound.
#3
Pitchshifting, most likely a Digitech Whammy since he controls the pitch manually.

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THE SINE WAVE SURFER σƒ τλε τρπ βπστλεπλσσδ

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[quote="'[BurnTheDusk"]']Boss pedals may be built like tanks but I would rather buy a cardboard box that is on my side than pay for a tank that is working against me.
#4
That is a Pitchshifter with a chorus in the effects loop.

Much too good of tracking for a whammy.
Sounds more like the Pitchfactor, it also can be used manually.

It's a rather expencive pitchshifter but looking at his hair it's only a little bit more than he pays his stylist .