Roy Jenson plays Cloud William, the chief of the tribe of "Yangs" (Yanks) on a parallel planet who have survived, evolved and waged a guerrilla war against the invading "Kohms" (Communists) by taking to the mountains and plains and adapting to the tribal lifestyle of the American Indian. In Red Dawn (1984), Jenson plays the father of Robert Morris, one of the main characters, a band of American teenagers who escape to the mountains during a Communist invasion of the United States and survive to wage a guerrilla war largely by adapting to the tribal lifestyle of the American Indian.
The Kohm guarding Dr. McCoy can be seen in green coveralls in "The Man Trap", both in the corridor and in the turbolift, and as one of the miners in "The Devil in the Dark". He can also be seen extensively as a background character in many episodes of Kung Fu and Hawaii Five-O.
NBC announced that Star Trek would be renewed for a third season during the closing credits of this episode, on 1 March 1968. In the announcement, they also wrote "Please do not send any more letters", responding to the vast amount of mail received during the protests organized by Roddenberry and Bjo Trimble.
Roddenberry originally wanted to produce this episode early in the first season, along with "Mudd's Women", but NBC thought the script was weak and ordered the staff to 'shelve' it for an indefinite time to be possibly reworked and produced later on. Despite NBC still objecting against it, Roddenberry finally had his way to make "The Omega Glory" during late in the second season.
It is learned that the Exeter had a standard complement of four shuttlecraft. During the search for survivors, Galloway informed Kirk that "all four of the craft" were still on the hangar deck. Whether all Constitution-class vessels were equipped with that number of shuttles is not made clear.
This is the first time the chief medical officer of another Federation starship, Dr. Carter, is seen. Although he is sitting in the command chair on the bridge, it is unclear if he is in command of the Exeter or is merely recording his warning. Not until Dr. Crusher was placed in command of the USS Enterprise-D in "Descent, Part II" would a doctor clearly be in command of a starship. (Dr. Crusher was technically in command in "Remember Me" when she was the only crewmember left; however, since it wasn't the real Enterprise, it cannot be counted.)
Despite Galloway's demise in this episode, David L. Ross returned as Lieutenant Johnson in "Day of the Dove" and as Galloway once more in "Turnabout Intruder". No explanation was given for the resurrection. According to Ross in the unauthorized biography of William Shatner, Gene Roddenberry wanted him to appear regularly in the series, but Ross was not interested in that much acting.
The remastered version of "The Omega Glory" aired in many North American markets during the weekend of 30 June 2007. The episode included dramatic new effects shots of the Enterprise and the Exeter in orbit of a more Earth-like, computer-generated Omega IV. Among the fine details inserted into the show, a small glimpse of the Exeter appears on the Enterprise viewscreen as it approaches the planet at the start of the episode.
The original 1965 script draft named the missing starship as the USS Argentina. The Enterprise landing party consisted of Kirk, Spock, a young navigator named Lieutenant Commander Piper, a helmsman called Lieutenant Phil Raintree, and the ship's doctor named Milton Perry.
In this episode, the USS Enterprise visits another world possessing a parallel-Earth culture. Other such examples include "Miri" and "Bread and Circuses". There are also Earth cultures in "A Piece of the Action", "Patterns of Force", "The Paradise Syndrome", and "Plato's Stepchildren", but they were introduced deliberately or accidentally and did not originate organically.