Can a reliever get two blown saves in the same game?

No, only one blown save per pitcher a game. More than one pitcher can be credited with a blown save as its possible to have leads going into a close out 1/2 inning and the pitcher gives up the lead. Once he gives up the lead and the team comes back to re-take a lead, that pitcher becomes the pitcher of record. If the team wins or loses, he will be credited with a win or loss. Otherwise if the team regains the lead only another pitcher can come into the game and earn a save.