Canadian & Australian name
Angry Birds 2 was first called Angry Birds Under Pigstruction. This was a placeholder name Rovio used for the beta version of the game. The name is still currently used in Canada. As with Australia, the name still remains as Angry Birds 2.
Mighty Eagle tips
In the game's beta version, Mighty Eagle would appear in the corner of the screen to give the player hints, as opposed to Red who took over this function in the final product. He also takes his appearance from the classic games. In Mighty Eagle's Bootcamp, he appears but not in classic design.
In the beta, the level score had a different design. It appeared as a piece of blank paper, with a differently shaped Destruct-o-meter which also featured a picture of classic Red.
The Beta Slingshot was made with a 3D model instead of a sprite.
Level Completed Screen
In the beta Level Completed Screen, only the birds who were used by the player in any given level would appear, rather than all the birds the player has currently unlocked showing up like they do in the final product.
There were some pigs that never appeared in the final product nor in files, just in concept art. Some examples are
a Bengal Tiger Pig, Panda Pig, Tortoise Pig, Bamboo Pig, etc. They were all meant to appear in Bamboo Forest.
Removed In Later Versions
In previous versions, players could choose their favorite bird, but it was removed. However, the bird chosen will still show in the map.