This is a good read, especially the part about how well Harold still managed to fit into a Neighbours that was so different than his own.
http://perfectblend.net/comment/theperfectend.htm
If I had any real complaint about the final episodes, beyond Terese/Paul (which the actors did sell), it's that I wish they'd let a few more characters actually leave - Leo, for instance, I am not sure would want to stay in a place where he saw his girlfriend/mother of his children die not that long ago and was then involved with a con artist he watched get dragged away in handcuffs. I do get the power of the imagery in almost everyone staying, of course.
Other than trying to figure out just why they were there (I guess Shane brought them as a goodbye surprise when he thought Paul was leaving Erinsborough) even the Charlene and Scott parts work well enough on a rewatch. It adds a certain multi-tiered quality as they are literally in their own little sphere, Susan is in her own, and they both look at all around them as the credits roll.