In the opening scene, Doc and Waverly are wearing different outfits from what they wore in the final scene of the season one finale, although the scene supposedly takes place only a few minutes after. Doc has on a different shirt, and Waverly is wearing different pants.
Wynonna tells Waverly that there are still 62 revenants, but there were 21 revenants shown being shot by Peacemaker on screen throughout the first season. Since there were 77 revenants to start, that means there are only 56 left going into this episode.