Colors credit confirmed by Anthony Tollin. Letters credit from Todd Klein via http://kleinletters.com/.
Dr. Light returns from Hell after the events of Suicide Squad (DC, 1987 series) #52. Hal mentions that the events of Superman (DC, 1993 series) #76 happened "just this morning." One of the Christmas gifts has the beginning lyrics to "Jingle Bells, Batman Smells" printed on the paper.