John Billingsley (Dr. Phlox) does not appear in this episode.

Bruce Gray (Surak) previously played Admiral Chekote in the "Star Trek: Deep Space Nine" episode "The Circle" and the "Star Trek: The Next Generation" episode "Gambit".

The Admiral Gardener mentioned in this episode is presumably the same one mentioned in both "Shadows of P'Jem" and "First Flight".

Though mentioned many times since, Surak is seen for the first time since the Original series episode "The Savage Curtain", in which he was portrayed by the late Barry Atwater.