When Iso and Jimmy were locked in the freezer, Jimmy found a vent grille, removed it and escaped to the outside. If this were a real freezer there would be no such vent, as the outside air would come in and thaw all the contents.
The car shown in the first scene which is supposedly in Japan is a left hand car, but cars in Japan are right hand drive.
Chin Ho says to McGarrett over the radio that the truck is marked Manoa, when in fact, it is marked Moana.