John Wesley Shipp, who plays Mr. Lahey, is the fourth recurring member of the Arrowverse to make an appearance; he plays Henry Allen, Jay Garrick, and alternate-universe Barry Allen mostly on The Flash. Colton Haynes (Jackson) plays Roy Harper mainly on Arrow, Tyler Hoechlin (Derek Hale) plays Clark Kent mostly on Supergirl, and Susan Walters (Natalie Martin) plays Dr. Carla Tannhauser on The Flash.
Jackson's vanity plate is his name and his lacrosse jersey number.