There are no power flowers in Super Mario 64. However, I do not if they exist in Super Mario 64 DS.
You dont
You have to enter the room as Luigi. The flowers don't appear for Mario or Yoshi.
you have to look up at the light in the foyer of the castle and you will get wings and you will get power flowers if you step on the switch on the tower.
There's 150 power stars in Super Mario 64 DS.
You cannot.
To show off the power of the Nintendo 64.(The nintendo 64 wasn't released until Super Mario 64 got finished.) :)
you can't
You partially answered your own question there. In Super Mario 64 DS (not the original N64 game), Luigi will notice flowers in the mirror room after the ? switch is activated. By using one he will be able to pass through the mirror.
To unlock them you after collecting 12 stars look up in the castle circle and activate the red switch to unlock all ? blocks.
No, Baby Mario is only in Mario Tennis for the Nintendo 64 and Virtual Console
Fatness XD
Not quite with controlls but it has to do with collecting power stars