Miller tells the Hornet the extreme cold would "rip the flesh from your hands", but the Hornet is wearing gloves.
The vault is supposed to be at 50 below 0 for the production of the diamonds, but the Green Hornet and Professor Miller enter without any sort of cold weather protection and Miller doesn't visibly decrease the temperature beforehand.
(Britt is holding a small transmitter.)
Britt: Someone using this, tuned to send out an ultra high frequency tone. And a leopard trained to respond to that tone and kill the nearest human to it. That someone programmed Pat Allen to die.
Scanlon: Can you prove it?
Britt: No. But the Green Hornet will.
Professor Miller's first name is Frank, which makes his name Frank Miller, just like the famous comic book artist.
This was the pilot episode, as evidenced by the different opening music over the "THE GREEN HORNET--IN COLOR" opening bumper, the masks worn by both The Hornet and Kato which otherwise only appear in promotional photos (After this episode was shot, molds were taken of Williams' and Lee's faces and form-fitting masks were cast), and the extended sequences introducing/establishing characters, sets, and devices.
It's also unique in that it's the only episode that The Hornet lets Kato do all the hand-to-hand fighting! (The Hornet just uses a gas gun.)