Continuity mistake: In first shot of Steve's dad's house ocean-,side, there is no crime scene tape, but two shots later as Steve enters from the back tape is shown in double rows across left side of back yard and across the length of the area under the upper deck. (00:10:25)
Continuity mistake: In the scene where McGarrett's dad's house is seen for the first time from ocean-side, deck on the top floor has furniture (wicker two-seat bench and two chairs under double windows with long table to the right) and the lower level has no furniture in grass to left of the ramp, and two large vases on either side of the ramp. Then two shots later (same scene) as Steve approaches under the crime scene tape, there is no furniture on the upper deck but now furniture to left of ramp and vases are missing. (00:10:25)
Continuity mistake: When Steve McGarrett takes the picture of the footprint, what is photographing is different from what was shown earlier; the print and the objects to the left shifted - easy to tell using the tiles as reference, since in the picture the heel of the foot stops right at the line between two tiles, while it went well across it in the original shot. (00:10:50)
Continuity mistake: When Danny and Steve are standing dressed like dorks in the parking lot outside Kamekona's joint, behind them on the left there's a guy who is changing bathing suits using a towel to cover himself. When they speak with the pesky kid the guy finishes his deed and leaves, but when Danny reaches inside the car for the big pink fuzzy thing, that guy is back in that spot. (00:26:05)
Continuity mistake: Grace Park comes out of the water and punches a guy; the part of the surf with the red and black logo faces up. Then she picks it up, and, in a way that does not register right consider her motion and the rotation, that side of the board is facing her. Another cut, and the board is facing the opposite direction. (00:28:20)
Continuity mistake: The police operation with Kono undercover begins showing a timestamp on the video feed saying that it's "Monday, 21:16:40" (approx). Inside the warehouse though, when the smuggler boss asks her what she does for a living, we're back in time at 21:14:18. From then on, the time changes inconsistently to 21:15:33, 21:16:46 (more than a minute when she is just turning around), 21:16:04 (again wrong order) and as he sends a text to the mole, the reply comes at 9:24, which would mean 5-6 mins have passed. (00:31:30 - 00:34:10)
Continuity mistake: During the undercover operation, Danny tells Chin to pull the plug on the operation "Let's get her out of there." Steve's hand is on his belt, but it then cuts to a close-up where he has his hand on the radio. Similarly, during a cut to a close-up on Daniel Dae Kim, Scott Caan's arm pops up in view out of nowhere. (00:32:35)
Continuity mistake: Steve manages to fire 2 to 5 shots through the car's windshield (the windshield is intact before that), but when the car crashes into the container it has no less than 6 bullet holes in it. And when he pulls Sang Min out of the car, from that camera angle the windshield has no bullet holes. (00:35:00)
Chosen answer: They are Junior's SEAL buddies.