The Dr. Marcus Blake character - Allison's brother - is, in reality, played by her actual husband, Dondre Whitfield.
When Zane and Henry are talking about creating a new body for Holly, Zane says, "We can build it. We have the technology." This is a reference to the beginning of the intro-quote from the old TV series THE SIX MILLION DOLLAR MAN. "We can rebuild him. We have the technology. We can make him better than he was before.. Better. Stronger. Faster."