I just called it what Andy called it. And he knows more about music than I do.
Oh, those whacky guitarists! 
In that context, it’s definitely a G#. It’d be kind of like calling the E in a C-chord an “F-flat.” They are enharmonic (represent the same key on a piano or string/fret on a guitar), though. Maybe way down low he’s just used to thinking of it as an A-flat for some reason.
It’s a chord. I think it’s a Bm. Sounds like one guitar is playing the chord and another is playing an F# pedal tone on top of the whole progression.
I haven’t checked with any instrument, but if you’re talking about the acoustic guitar, it sounds like a sus4 going into a major chord. I don’t hear minor there.
ETA: And as far as the electric guitar over it, I just hear single notes, sliding up A to B (maybe played as an octave on the low E and D strings–I can’t quite tell if it’s an octave or not, but it’s the same note.) And the backing chord progression is Dsus4 to D major, now that I could check with an instrument for pitch.
I was going to mention Do It Again.
That’s what I (and I think the poster – note the timings posted coincide with the electric slide) was referring to. And yeah, might be an octave, can’t say.
Four chords in a row, but each is as long as the chord at the beginning of A Hard Day’s Night: the opening of White Room, by Cream.
“Welcome to the Machine” has some grungy sound effects of no musical consequence but kicks in with a couple of gently strummed chords, thus. Instantly recognisable.
My first thought was the opening to The Kids Are Alright.
Might be a bit too obscure, but
The opening chord for JailBreak (Thin Lizzy - Jailbreak) is immediately recognizable to me.
–G!
Fight for Your Right to Party is the first opening cord I thought of. You know what song it is before anything else happens.
Sorry, I was listening to the *first *chord, then I went back and saw the post was at specific times. Yes, sounds like an octave to me.
I agree with this.
I think that chord
has a lot of Rock And Roll High School in it.And to my mind an octave isn’t a chord. It’s a single note with an overtone or something. ETA: or a 12th chord? 
My 2 cents on THE CHORD.
- There are only two THE CHORDS. One is sort of described by Leonard Cohen and the other started off a Beatles song.
- I think everyone agrees George played an Fadd9 on that Rick 12. Analysts say John played a Dsus4. But there’s a clip on YouTube of them performing the song in concert (NOT lip-syncing) and John plays an Fadd7.
- Somewhere I read there was an acoustic guitar in the studio, unpicked, fretted, or strummed, but it just picked up some vibrations. I can see an A, D, and G getting into some sympathetic vibes.
I agree; an octave isn’t a chord, it’s a dyad and it doesn’t even imply a chord.
There is no such thing as a 12th chord. The chord extensions are 7, 9, 11, and 13. The 12th would be enharmonic to the 5th, which is already in a major or minor chord so nobody ever says that (also 8th=tonic, 10th=3rd so those aren’t used either).