Included as a "Bruce Timm's Top Picks" bonus on the Green Lantern: First Flight (2009) blu-ray.
In Despero's flashback, one of the creatures that witnesses his return bears a marked resemblance to the Fantastic Four's Thing.
Katma isn't wearing anything underneath the skimpy outfit, so when she puts away her ring underneath the skirt there's an uncomfortable implications of where she put it.
John used to date Katma, his fellow Green Lantern and mentor.