Jeff*H
Premium
One of the reasons I always loved the first 4 seasons a little more than the rest is because they would start each episode with a 5-second title intro, followed by a story teaser that would last about 2-5 minutes setting up a mystery, then the opening title credits. Season 1's 5-second title intro had the gorgeous beach shot with sunset that Jeff# mentions above, then seasons 2-4 featured the traditional rolling wave 5-second title intro that is also featured in the opening credits.
The later episodes started immediately with the title credits, eliminating the story teaser. By the last few seasons, they added a 30-second preview of the episode, followed by the opening credits. These 30-second previews usually get cut in syndication.
Season 1 also featured different end credits than seasons 2-12; the credits featured a flashing siren on top of a police car racing through the streets at night (which "Police Squad"/"Naked Gun" would later make fun of). The rest of the seasons featured the guys paddling in the outrigger.
The traditional opening theme song was re-done several times during the series' run. Season 1 kicked it off, but a new version of it was done for seasons 2 and 3. A slightly modified, more drum-laden version was done for season 4, then yet another version in seasons 5 and 6. Thereafter, it continued to be tweaked each season until the end of the series, during which it had a bit of a disco beat added.
To date, no TV theme has come close to matching the jazzy, cool beats of the Hawaii Five-0 theme.