Errata

In the downloadable code for the class DraggableSprite, it should look like this:

// Detect a drop by listening for mouse up on the stage
stage.addEventListener( MouseEvent.MOUSE_UP, mouseUp );
}

function mouseUp(e)
{ drop();
}

In your version you call drop() directly as an event handler, but that requires a parameter for the event object.

The ASCB library mentioned in the book is hosted on http://www.rightactionscript.com/ and it seems that domain/hosting expired. AFAIK, the mentioned code library cannot be downloaded from anywhere.

the result of the code "trace(newLetters)" is
"a,b,c" not "d,e,f"

the following is my testing code:
package edu.tongji.sse.number
{
import flash.display.Sprite;

public class TestArray extends Sprite
{
public function TestArray()
{
var letters:Array=["a","b","c"];
var newLetters:Array=letters;
trace("before change:");
trace("letters="+letters);
trace("newLetters="+newLetters);
letters=["d","e","f"];
trace("after chage:");
trace("letters="+letters);
trace("newLetters="+newLetters);

}
}
}

the result is:
before change:
letters=a,b,c
newLetters=a,b,c
after chage:
letters=d,e,f
newLetters=a,b,c

says: ...packaged in flash. display package -- should "display" be "text"?

the password property you describe in the book does not exist... its rather TextField.displayAsPassword = true

import flash.media.SoundMixer;

is missing from the list of imports

The NetStream DOES NOT toggle between play/pause like its printed in the book... togglePause does that... pause() ONLY pauses and does NOT accept arguments like on the book... to resume we use the NetStream.resume() method.
http://livedocs.adobe.com/flash/9.0/ActionScriptLangRefV3/flash/net/NetStream.html#pause()

Multiple errors in example script (example as written will NOT run).

Already confirmed error: import flash.util.* should be flash.utils.*

Not currently listed errata:

"loader.dataFormat = DataFormat.TEXT" should be "loader.dataFormat = URLLoaderDataFormat.TEXT"

In the definition of the function handleComplete() the passed variable is given the variable name of "event"...but half the code refer to the variable as "event" and the other half of the code, specifically in the catch statement, assumes the variable is named "e". This forces the catch to be tripped each time.

Since naming a variable similarly to a reserve word can cause confusion, the function would be best rewritten as:

private function handleComplete( e:Event ):void {
try {
// Convert the downloaded text into an XML instance
var example:XML = new XML(e.target.data);
// At this point, example is ready to be used with E4X
trace(example);

} catch ( e:TypeError ) {
// If we get here, that means the downloaded text could
// not be converted into an XML instance, probably because
// it is not formatted correctly.
trace( "Could not parse text into XML" );
trace( e.message );
}
}

As so many others have noted here, O'Reilly needs to start running the code it presents as examples - especially if a book is published before the final version of the software comes out - and then make sure that any errors discovered are corrected in future printings of the book. O'Reilly books did not used to have all of these mistakes...and as a programmer I need to be able to rely on the example code if I am teaching myself out of a book - because I will not be familiar enough with the syntax to catch the errors and separate bad examples from my own errors.