In the scene with the grenade, the bad guy initially picks up and holds a comparatively newer M26/M61 model grenade. In remaining shots of the same sequence, it suddenly becomes a WWII vintage MK2 "pineapple". (Spoiler here) Also, as Saiko is falling, palms open, her hands are clearly empty. Once she's lying down, she opens her hand and lets go of the grenade.
At the start of the film when the Asian girl enters the room the man reaches for and picks up a smooth M26 hand grenade but in the next scene it miraculously becomes and Mk 2 Mills bomb type of grenade.
When the plane is forced to make an emergency landing, the setting is a very wooded mountainous area. The next scene after leaving the plane is set in the Arizona desert where the surrounding area is sandy and very flat.
While broadcasting information about Yuji Kobayashi over the police radio, the police officer mispronounces his surname as "Ko - ya - bashi."