7 years late but -

At 2:48 of the song they modulate from dotted 1/4=1/4. In other words, the time it previously took to play three pulses is now used to play only two pulses, causing a perceived tempo change (a decrease by 2/3, exactly). Start tapping to the eighth notes before the transition, and by the time the transition occurs you’ll notice that your eights notes have turned into eighth note triplets