The only time the Ferengi Rules of Acquisition - the running gag from Star Trek: Deep Space Nine (1993) - are mentioned in TNG.
Patrick Stewart suggested Scott Weinger, (best known for the title character voice of Aladdin (1992)) for the role of Jason Vigo.
Sandra Rhodes was named after an Air Force officer and Star Trek fan.
Frank Corsentino played the role of DaiMon Bok in The Battle (1987), but he couldn't be located to reprise the role. He was supplanted by Lee Arenberg, who had Ferengi experience from his roles in The Nagus (1993) and Force of Nature (1993).