The Black Beauty's license number is "V194".
Colony's cane tip, which Britt finds beneath a car, is not lying on the ground in the shot where he drives up.
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.
How did the Black Beauty get into the back of Marcus's semi totally unnoticed?
Britt is awfully clean when he goes into the dairy/distillery. Wasn't he just thrown from a moving car onto dirt?
Britt is wearing a light blue suit when he's "delivered" to Dirk. Look closely, as he (as the Green Hornet) captures Dirk, his trousers are dark.
Professor Wylie's secretary is shown running to his burning car twice (she screams the second time, has no reaction the first time).
Perhaps she was too shocked to notice after the explosion, but wasn't Vanessa Vane curious as to how the Green Hornet knew her name AND where she lived when he told Kato "We'll take Vanessa home, then go see Eden"?
The full power laser has a reddish color when shown coming out of the laser gun, but the same blueish color as regular power is shown when the laser hits Black Beauty.
The Hornet is sitting on the right and Jimmy Kee on the left in the back seat, yet when the Hornet gets out of the Black Beauty he gets out of the left door.
When The Green Hornet meets up with Duke Slate, Duke pulls out a rifle from the back seat of his car and attempts to shoot The Green Hornet. The Hornet aims his "Sting" weapon and destroys the rifle. As the rifle crumbles and goes up in smoke, the control cable that made the rifle go up in smoke, is very visible coming out of the base of the rifle, and almost becomes entangle around Duke's arm as it falls from the car.
A comatose man is shown walking onto the Sally Bell.
Honey Boy is shown loading multiple bullets into his rifle, then is shown reloading after every shot.
The man's name is "Selden", but when the Green Hornet pages him on the intercom he clearly calls him "Sheldon".
More of a nitpick: How did Mike know an elevator car was coming? No one else was around to push the call button and I didn't see him do it.
During the fight in the Mammoth Insurance boardroom, Green Hornet swings to punch his opponent, but clearly misses by a few inches.
When the bulldozer first tries to run over Mike after he crawls out of the destroyed shack, you can clearly see that it isn't the actor who plays Mike, but a stuntman instead.
As the Green Hornet and Kato in their Black Beauty, follow Jack Starkey to a phone booth, they turn and drive over the curb. (you see the back-end of the car go up then down)
At the second fire, the warehouse guard dials the phone before he picks the receiver up.