Continuity mistake: When "Uncle Chin" introduces himself to Grace, the kid's pigtails move from the front to the back of her shoulder, back and forth between shots. (00:01:05)
Continuity mistake: When Danno talks about tennis and is interrupted by his daughter he tells her "You're supposed to be paying attention" with the foam hand at the side of her head, which disappears at the cut. (00:01:40)
Continuity mistake: Danny and Grace get up to go buy some nachos; at the cut, both Chin and Steve's hands have changed position. (00:01:55)
Continuity mistake: After the opening, Kono check out of the unidentified victim. In close-up his torso is fuly covered, in the wider shot his jacket is open showing bare skin between jacket and wifebeater. (00:04:55)
Continuity mistake: At the pizza place, there's a remote in front of the owner when the two detectives arrive. Nobody touches it, but when Scott Caan grabs it, it is in a different spot of the table. (00:20:10)
Continuity mistake: When Danny and Steve leave Joey in the shark cage, he looks at them panicked grabbing the side with the ladder, but when they take off, he's clinging to the opposite side of the cage. (00:22:35)
Continuity mistake: Kono just entered the casino posing as waitress-entertainer. She is snooping around and a guy promptly shoos her back with the others. She does a sassy lil' move with her right hand...but it's the left hand at the cut. (00:28:25)
Continuity mistake: Kono and Danny do a bit of theatrics distracting Frank Salvo and his men that are about to waste cousin Sid. The henchman behind the Samoan gang member is not touching him in the wide shot, but has both hands on his shoulders in the closer cut. (00:34:15)
Continuity mistake: Watching the old football game, when number 5-O gets tackled, Kono takes a handful of popcorn that she already took in the previous shoot (a close-up on Scott Caan). (00:39:15)
Chosen answer: They are Junior's SEAL buddies.