Super Dreamland 64
Location: Unknown
Once Upon A Time...
Mushrooms
There are two types of mushroom with the same effect - when you shoot them they'll fire into the air before descending on nearby enemies.
Cannons
Cannons are more interested in taking out the castle than players - after a few minutes, they'll reduce it to rubble.
Cottages
These cottages are a good place to find powerups, you just have to destroy them first.
Evil Castle
There a a few powerups to be had on your way to the castle - once at the top you'll be propelled out of the wells.
Bridges
You'll find a repair wrench hiding beneath the bridges - destroy them to slow down the progress of heavier vehicles
Wells
Fall into the moat, or make your way to the castle to be ejected from one of the wells.
Weapons & Powerup Spawn Points
The bridges and the carrot/cabbage fields usually reveal the odd powerup or two.
Rainbow
The rainbow makes sporadic appearances, so if you see it, try to get to the end of the rainbow, where you'll be rewarded with a health boost.
Chickens
There are numerous chickens scattered throughout the level - if you can bring yourself to do it, destroy them to release a cloud of butterflies (and possibly a powerup...)
Pigs
As with the chickens, if you're heartless you can take out the pigs - more butterflies, more powerups.
Knights
There are two types of knight - those guarding the cannons which march around them (indestructible) and knights with lances which march quickly around the perimeter path. A few rockets to the latter wil destroy them.