This episode makes a strong argument in favor of gun control. More importantly it features the first appearance of Edward "Duke" Lukela, played by frequent former guest Herman Wedemeyer for the next 8 years until the end of the series. Actually, Duke's last name is Kanaha in this episode, but it was soon changed to Lukela. Duke would eventually be promoted out of HPD and became a member of McGarrett's Five-O team in the 8th season. He wouldn't be in the opening credits until the 9th season.
Guest starring Michael Burns, and a woman who never should have quit "Smallville": Annette O' Toole.