I've been involved in an extended conversation with John Papola, the creator of the "Keynes vs. Hayek" video, in a blog post by David Henderson.
The post starts off by talking about one of Papola's remarks on behavioral economics. My initial concern was that he's conflating questions of cognitive bias with questions of socialist calculation unnecessarily. We can "solve" cognitive bias problems in ways that governments are doomed to failure in addressing calculation problems (for example - on savings decisions its plausible to think we can start to over come "status quo bias" but still recognize we can't centrally plan individual savings levels). That, however, quickly turned into a discussion of Keynesianism. My comments were rushed during lunch breaks and early in the morning so I hope I've done it justice - he comes at me with a lot of questions, so I'm sure I dropped some of them. But I think its instructive because he's peddling a lot of the fallacies about Keynesianism that I talk about on here - that Keynesians actually want to plan economic decisions, concerns about heterogeneity in depression, confusion of the savings identity with a behavioral law (which is done by assuming we're at full employment), talking about Keynesianism as if investment doesn't matter and consumption is paramount, etc. etc. Anyway - I try to succinctly address all of that because it all crops up.
If you (1.) live under a rock, or (2.) just want to see it again, this is Papola's video: