I don't think there was an malice in Paul and Harry's comments. This was actually recorded very close to his death. They were still coming to terms with the loss of someone they had bantered with on a daily basis so that was still there.
Plus you could see Paul's eyes were watery. At the end of the day these guys are comedians and its hard to stay serious without feeling the need to lighten it up. That's all they did.
I enjoyed the show and was unaware at how much he had been involved with. Great respect.