Check it out on you tube, it runs just under 4 minutes.  Near the end of Carter heaping praise on Bush, George just can't help a priceless smirk from momentarily crossing his face.  After 8 years of Carter savaging him and his presidency, this was so out of type that George couldn't hide his amusement/bemusement.  As to nobody listening, rather a lot of people in a blue ribbon audience of dignitaries from the Bush and other administrations and from around the world (Blair, Berlusconi,  etc.) in the large audience were listening to all five presidents' remarks and so were thousands in the TV audience.  (Also out of type, MSNBC carried the opening ceremonies and speeches live while Fox News did not.  LOL)