First thing you need to learn is to hold, don't tap the flap button.

But also don't keep your finger pressed too long.

Always try to approach cannons low, as overshooting means Game Over.

Try to get the hipster as high as possible in the air, using balloons and all other means, as it will make things a lot easier for you.

Some items that would give you different boosts (like traffic lights, manholes and so on) can be easily spotted if you look at the sidewalk across the street.