On one side, there’s the heaviness of Macdonald’s death and his memory. On the other side is the special itself, which is not quite ephemeral, but it’s close. It’s thin. Some portions are striking and fun, some feel like incomplete approaches to an idea that’s not fully there yet, some are simply overworn premises without enough oomph to distinguish them. ... The indistinctness of Nothing Special does create an opportunity to remember him. Like the comedians gathered at the end, it’s an invitation.