Steve's iPhone has Checkhov's Digital Recording App installed.In the climactic confrontation at the end of "Oia'i'o," Steve uses his phone to record the Governor's confession that she's tied in to Wo Fat and ordered the murder of Laura Hills. After he's tasered, Wo Fat directs the Governor to hit the "delete" key, then shoots her dead almost immediately. The file's been deleted, but that doesn't mean that a person skilled in computer forensics (like, say, oh, maybe CIA intelligence analyst Jenna Kaye or the newly-reinstated Lt. Chin Ho Kelly of the Honolulu Police Department) can't recover the data and reconstruct the file. We should find out this fall.
Wo Fat replaced the $10 million the team "borrowed" from the HPD evidence locker for Chin Ho's ransom in "Hana 'a'a Makehewa."He'll use the threat of exposing the team's unauthorized appropriation to try to blackmail McGarrett and/or expose the "borrowing" to destroy Five-0.
Jenna Kaye is dirty.Wo Fat has sent her to Five-0 to mislead our guys. Remember when he and McGarrett meet face-to-face for the first time, he threatens to kill her so Steve backs down? No wonder that works so well. CONFIRMED: The Season 2 pilot shows her driving Wo Fat away after the latter clears up a loose end.
Kono is The MoleInternal Affairs recruited her to infiltrate the dirty cop organization. That's why her removal from the force was made so public and so devastating; to make the bad guys think she was the end of her rope and ready to join them. CONFIRMED: In "Maʻemaʻe", it was revealed that Kono was working for Captain Fryer, who was looking to take down his former partner's money-laundering operation.
Danno is an atheist.In Ka Iwi Kapu, Danno trespasses onto ancient Hawaiian burial grounds. While this may leave room for him following a religion, he responds to Steve telling him off with "I only believe what is in front of my face, and sometimes not even then."
"Shelburne" is GameraConsider the evidence:
Wo Fat is McGarrett's real father. Or brother.
Lt. Rollins is an Office of Naval Intelligence spook of the Minder variety.
August March's appearance is Decade's fault.It explains how a character from the original series has ended up in the reboot, Decade managed to stop the merging of the Kamen Rider worlds, but other worlds such as the Worlds of Five-O/0 (Five-O/0 no Sekai) are still converging.
This show came to an end when the events of Revolution occurred.A worldwide blackout rendered the television useless, and left just about everybody unemployed. That's one way to get a show cancelled.