The title screen counts as a title screen theme. Many early games didn't have a title screen theme. It was just Name/Logo of game and game options.
Anyway, I have another secret to share: In Super Mario 64, the level Snowman's Land (I think that's it.. it's the second snow level), there is a lone coin that is very hard to reach. It is under the arm of the giant snowman that is holding the bridge across his arms up.
The coin can best be seen from close to where the canon opening is. I've collected it before when I was trying to get 100 coins in the level (for the Star).. Ironically, it was the 100th coin, and the Star floated up into the snowman's arm, and out of reach.
I call this a secret because it seems that many of my friends who are gamers have no idea that this coin is there. I am the only one who tries to collect it.