When Bonner itemizes Bernie's loan plus interest, he says it's $25,000 for the loan and $45,500 for the interest. He then says that if Bernie comes up with the full $72,500 by Thursday... For that total, the interest should have been $47,500 or the total should have $70, 500.
Infrared photography of an active volcano is proposed as a method of locating explosive charges. Unless the charges were massive, and much cooler than the surrounding terrain, the idea is not feasible.
The idea of triggering a volcanic eruption with explosives is patently absurd; it's not the same as triggering an avalanche.
Seven or eight men seem to be too few to plant 15 or 20 tons of dynamite in such a short period of time.
When McGarrett and the governor are viewing the volcano film, the film runs out and is flapping around on the take up reel, but the rumbling sound of the volcano is still going.
When McGarrett makes a quick helicopter stop at the Doctor's house to retrieve the remote control box, he leaves a safety belt hanging outside when he shuts the door and take off again.
When the HPD helicopter (Hughes 369 N9014F) makes its first landing, the sound is incorrect, probably dubbed from a Bell 47. But when it lands at the volcano observatory the sound is correct.
When Brown fired two shots in succession to kill the day laborers, the one on the left falls into the pickup truck bed after being hit, but prior to the second shot, the one on the right missed his cue and fell before the shot is heard.