Q: it sounds like there is no key change from the chorus to the verse at 1:30-1:40 (same as 0:12-0:22)
A: going from the chorus to the verse, they use Eb as a pivot point, because Eb minor exists normally in Gb, and if you arrive at Ebminor but then use Eb major instead, then that sets you up to go forward in an Eb maj key (or Cmin).