(NOTE: I'm using O'Reilly's Safari to read this book, so I don't know the exact page number.)

In Chapter 9, section 9.1 Bitmap Caching, the setMask property in the example below doesn't compile in Flash CS3 (I get a "this property doesn't exist" compile-time error):

mask.cacheAsBitmap = true;
maskee.cacheAsBitmap = true;
maskee.setMask(mask);

The correct way to set a mask is:
maskee.mask = mask;

Where .mask is the correct property.

Note from the Author or Editor:
Corrected in a later printing.

code in section that reads:

function showChildren(dispObj:DisplayObject):void {
for (var i:int = 0; i < dispObj.numChildren; i++) {
var obj:DisplayObject = dispObj.getChildAt(i);
if(obj is DisplayObjectContainer) {
trace(obj.name, obj);
showChildren(obj);
} else {
trace(obj);
}
}
}

showChildren(stage);

This code does not work in Flash CS3 and causes Compiler Error

Note from the Author or Editor:
Corrected in later printing. Because this function is recursive, the data type of the argument should be "*", or untyped. This will allow both DisplayObject and DisplayObjectContainer to be accepted by the argument.

It says that in the paragraph to look at the

Note from the Author or Editor:
Corrected in a later edition. The file name appeared incorrectly in the text, but correctly in the image caption. It is called z-sorting.fla. A new file will be created and added to the source archives.

The text reads:

Note from the Author or Editor:
Corrected in a later printing. The line
btn.name = "button" + i;
was omitted. There is no prior AS2 version of this book. This was just an omission that occurred during production. The line numbers are correctly referenced in the current edition, but a duplicate submission confirms that this was caused due to the omission of the above line.