Granted, the jeering did nothing to enhance the perceived legality of the execution. Nor did it enhance the credibility of Iraqi Prime Minister Nuri al-Maliki that it was carried out in such a non-professional manner.
The taunts of "al-Sadr" by the onlookers shouldn't be taken as a sign of that pseudo-cleric's strength. They were just trying to get under the skin of Saddam Hussein.
What the U.S. can really take away from Saddam Hussein's execution is other people have their own minds. If the U.S. makes a point of endorsing a candidate, relevant voters will rebel. No nation's leader will allow themselves to be seen as taking orders from the U.S. So they will rebel too, even if their choice is ill-advised. And that includes Iraq. Yes, we fought a war to get rid of Saddam Hussein
But that's the thing about a gift. Once you give it, it's theirs.