The momentum of the Klingon's body was sufficient to completely shatter the upper deck floor when falling from a standing position, but merely cracks the lower floor after falling several meters.
Despite all the talk in this episode about the alliance between the Federation and Klingon Empire, it is extremely odd that the Klingon ship would have the Federation insignia next to the Klingon one on its backdrop.
When the away team and the Klingons beam back from the Batris, Geordi starts moving before they have completely materialised.
The Klingons in this episode have teeth like humans.
For some reason there's a relatively fragile glass floor panel in Engineering at the base of a big high shaft. Since they have transparent aluminum, it seems absurd to use glass for floors.
The Klingon Korris makes reference to the Klingons' homeworld as "Kling." - "I refuse to let the traitors of Kling pick the meat from my bones." This is the first and only time the Klingon home planet is called "Kling" - it is later "officially" named Qo'noS in the sixth Star Trek movie.
When the Klingons escape they shoot and kill a member of the crew. Medical technology may allow him to be revived (for example, the attempted revival of Tasha Yar just a few episodes later in "Skin of Evil"). However, the security team that arrives simply leave the corpse lying in the corridor, even though they significantly outnumber the Klingons and one of them could have been spared to help transport the casualty to sickbay.
Yar: I thought we were going to have a problem.
Yar: Yes! For a minute it looked as though Korris was going to take that little girl as a hostage!
Worf:: It is not our way. Cowards take hostages. Klingons do not.
This marks the first appearance for the brig in the series. It is actually a redress of a crew quarters. In future, the brig is given its own set using a large door (redress of a cargo bay and holodeck door) with many cells in place of a single cell.
Footage of the K't'inga class Klingon Cruiser is taken straight from Star Trek: The Motion Picture.
Vaughn Armstrong makes the first of many Trek series appearances in this episode. Up through Star Trek: Enterprise he would play ten other characters.
Worf first mentions his foster brother in this episode, though not by name. Nikolai would not be mentioned again until the seventh season episode "Homeward," where we learn a little more about Worf and Nikolai's history together.
Counselor Troi (Marina Sirtis) and Wesley Crusher (Wil Wheaton) do not appear in this episode.
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