From what I have seen, the seasons 2 to 5 opening credits all have the same variation of the theme, and the copyright is always MCMLXVI. But the closing themes differ, the instrumentation varies depending on the season.
In the 1st season, episodes 1 to 8 have the narrated opening titles. Starting with the 9th episode is where the familiar cartoon style opening credits begin, along with the 1st season theme which fits in very well with the black and white episodes. The copyright is MCMLXV.
I don't know why they didn't adjust the copyright year on the episodes, the 1967 episodes should read MCMLXVII, the 1968 episodes should read MCMLXVIII, the 1969 episodes should read MCMLXIX, and the 1970 episodes should read MCMLXX.
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