I find it annoying when he generalizes insufficiently. Really, smart people follow the pack? Unlike all those average people I guess. Quick, let's invent some post-hoc explanations!
I mean, it's okay; it's hard to have too many "to don't lists." But the post-hoc explanations are fairly bad.
Also, following the pack is often a very smart thing to do. Or even better, figure out where the pack is going, and then run out in front of it.
On Quora: What are some stupid things smart people do? Examples of common types of stupidity that are typical of otherwise very smart people.
Lee Semel's answer in particular would make a great post here: a "to don't" list. You may wish to go through and identify the cognitive bias or biases each is an example of.