When Mr. Portman runs from his shop with Five-o in pursuit, he is driving a 1969 Lincoln Continental. When his car goes into the water, it is a 1965 Lincoln Continental.
When McGarrett picks up the recorder to play back Colby's voice, he doesn't hit "rewind" first, so it should not play back what it just recorded.
When Five-O is in pursuit of Mr. Portman, Danny reports that they are chasing him down Ala Moana Avenue. The correct name is Ala Moana Boulevard.
The cassette recorders used for the sting operation were called "Tranasonic" and that lettering is at the top in black letters, but looking closely the Panasonic name can be seen at the lower part of the recorder.
In the final scene Ron Colby threatens Swift, which is secretly recorded by McGarrett on a Tranasonic recorder. However, when the recording is played back, Colby's voice sounds noticeably less intense than when he first made the threat.
The show begins with a shipment of refrigerators being hijacked near Santa Rosa, California. But it is somewhat implausible that 110 refrigerators could have been loaded into a multi-wheel truck.