Angry Birds Reloaded/Glitches

It is possible to obtain thousands of coins by completing an uncompleted level set without quitting while getting an error message on one of the levels.

Matilda
Upon collision, her voice sounds like Bubbles.

The Blues
Upon collision, their voices also sound like Bubbles.

Matilda
When collision, her feathers look like Hal's.

Double Powerup Purchase Glitch
As of the 1.9 update there is a bug where you can buy a Power-up when you have don't have the right amount of coins, so if you buy it right after buying one you do have the amount of coins for another.