Hi guys. To start off, I'm trying to figure out the methodology behind the note selection of one of my favorite songs. It's a song called "Cars and Calories" by Saves the Day. The song has two bass hooks in it that really grab me.
For reference,
here's the tab, and
here's the song. If you're not a big fan of emo/pop-punk, stay clear of the song itself

, the tab appears to be almost completely correct.
The hooks in question come in the verses. The first hook is E8, A7, A5, played twice (the tab has those notes played on higher strings [A3, D2, D0]). It's just a major third upward, major second downward, right? (Have mercy on me, I'm beginning learning theory).
But in the last verse, the last time he would be expected to play that hook, he instead plays A7, D5, again played twice in succession. I think that's a minor third upward.


That hook COMPLETELY makes the song for me. The thing that bothers me is, I don't hear any changes in the guitar, I don't hear any changes in the singing. The drumming seems to be different when he plays the second hook, though. More anxious or something, but it's very subtle.
I lack the vocabulary to express what I'm trying to ask, and I apologize for that. And to a lot of you this must seem like the biggest mountain made out of the smallest molehill ever. But I really want to know how the change-up in notes can grab a listener.
To those of you with the patience to read and respond helpfully to this, thank you very much.
