After the wino is found murdered with a dollar coin on his lips, mcGarrett looks at the coin and calls it a silver dollar. In fact it is a 1972 Eisenhower dollar containing no silver. So technically it is not a silver dollar.
As Che Fong is examining the first postcard, there is an obvious dub, but the voice is clearly not the actor Harry Endo. It actually sounds more like Jack Lord.
One of the cases is related to HPD Officer Brian Tanaka. But there no details on exactly what this case was about. Eddie drives through a red light in downtown Honolulu which officer Jimmy Wong notices and pulls him over. Asked for his driver's license, Eddie pulls out a gun and shoots Wong, who is rushed to Manoa General Hospital. While at the hospital, McGarrett's temper flares and he sternly warns the HPD officer on guard that no one gains access to the room without verified identification.