Richard Loo had previously played the Shaolin Master Sun in the original pilot, and would reprise the role once more in the third season episode Besieged: Cannon at the Gates (1974). He would do three other episodes playing three different characters.
The typewriter in Lin Wu's cabin is an Oliver Typewriter of unknown date. The Oliver was produced starting in 1894, which would make it inappropriate for the time this series is set in. A second typewriter of unknown make is also briefly seen in an office, and it, too, is of much later manufacture.