Acting for Two: In the second serial, the crooks tried to take over a company by hiring an actress to impersonate the woman who just inherited it. Both roles were played by the same woman.
Fake Nationality: A Chinese note (Keye Luke was born in Canton) actor, using a fake Japanese accent, portraying the Korean scientist/valet Kato.
The Other Darrin: The role of Britt Reid/The Green Hornet was recast between the two serials.
Stunt Casting: An audio version — when Gordon Jones donned the Green Hornet's mask, radio Hornet Al Hodge took over the dialogue. (Lip Lock issues were avoided thanks to the serial Hornet's full-face mask.) Dropped for the second serial; Warren Hull delivered the Hornet's lines himself.