These are the glitches that occur in Angry Birds Rio.
In the online version, restarting the game a lot multiplies the number of items and caged birds, in which this was fixed later.
Golden Beachball Glitch
Go to the Golden Beachball episode. Fail a level with the caged birds. You will hear the Marmosets laughing instead of the birds crying, but the crying caged bird's face still appears on the level failed screen. (Note: It doesn't matter which "Golden Beachball" level you are on, but it still has to be a level with the caged birds.) This glitch also works on Angry Birds Trilogy.