The Klingon portrayed by John Tesh (uncredited) became a Name in the official Star Trek Customizable Card Game: K'Tesh. A modification of the actor's Name.
As all the Klingon costumes were being used for the concurrently shot Star Trek V: The Final Frontier (1989), most of the Klingons are actually wearing boots from the old Planet of the Apes (1974) TV series.
Before the anbo-jutsu match, the Rikers say "Yoroshiku onegaishimasu" which has various meanings, including (roughly) "Please" and "Thank you", depending on the context. In this context, it means something like "Please treat me well" "or "I look forward to working with you" and is used in the martial arts as a formal way of showing respect to your opponent.
Cmdr. Riker's childhood pictures with his father have a mountain in the background. That is Denali (formerly Mt. McKinley) viewed from the north.
John Tesh: erstwhile host of Entertainment Tonight (1981) appears as the Klingon K'Tesh in Worf's Ascension Chamber on the holodeck. His appearance was heavily featured in "Entertainment Tonight" at the time.