I've posted this on a couple of the Facebook groups too but wanted to share my research here with everybody.
By the stats, the Riders haven't lost their first game in half a decade but still managed that year (2006) to make it all the way to the Finals; this was before Durant, Fantuz and a few others if memory serves so I'm optimistic that we'll be able to rebound from Sunday. Going forward, I will start updating the list along with other comparison stats each week on my scoretarget.com site:
SSK 0-1 -- last occurrence: 2006, ended season 3rd in West, lost Final to BC
BC 0-1 -- last occurrence: 2009,occurrence, ended season 4th in West, did not qualify for playoffs
CGY 0-1 -- last occurrence: 2009, ended season 2nd in West, lost Final to SSK
EDM 1-0 -- last occurrence: 2009, ended season 3rd in West, lost Semi to CGY
WPG 1-0 -- last occurrence: 2010, ended season 4th in East, did not qualify for playoffs
HAM 0-1 -- last occurrence: 2010, ended season 2nd in East, lost Semi to TOR
TOR 1-0 -- last occurrence: 2009, ended season 4th in East, did not qualify for playoffs
MTL 1-0 -- last occurrence: 2010, ended season 1st in East, won Grey Cup