Wondering if anybody else noticed this?
Count 1-2-3 when Britt says "Yeah, two, three!" at 1:11, and then continue counting even though he drops out. You will count 4 and 5 alone, but you can barely hear him count the 6 just before he sings the line "SEVEN years ago" right in rhythm.
Bonus: At 1:23, you can hear the non-singing voice (in the right speaker) casually toss off "eight" as an afterthought.
I thought it was pretty cool.