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.
How did the Black Beauty get into the back of Marcus's semi totally unnoticed?
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.
Colony's cane tip, which Britt finds beneath a car, is not lying on the ground in the shot where he drives up.
The Black Beauty's license number is "V194".