I don't know if there is other little riffs he plays, but I'm almost certain that  
this is used pretty much through the whole song. Otherwise let me know :) 

Capo: 7th Fret 

       Am            G             Am            G              Am 
e|----------------------------------------------------------------------------| 
B|----1------------0h1p0----------1------------0--3p1p0h1-----1---------------| 
G|--------2---2----------0---0--------2---2-----------------------2---2-------| 
D|----2-----2------0-------0------2-----2------0--0-----------2-----2---------| 
A|--0---0-----------------------0---0-----------------------0---0-------------| 
E|---------------3----------------------------3-------------------------------| 

        G              Em               D 
e|-----------------------------------0h1p0-------------REPEATE----------------| 
B|----0h1p0-----------0--------------------3---3------------------------------| 
G|----------0---0---------0---0------2-------2---------REPEATE----------------| 
D|----0-------0-------2-----2------0------------------------------------------| 
A|-----------------------------------------------------REPEATE----------------| 
E|--3---------------0---0-----------------------------------------------------| 

p: pulloff 
h:hammer on