You have the eccentric supreme leader, who claims to be just another equal among the group, yet issues edicts that the whole organization must follow. Scientology has Hubbard, Zappos has Hsieh.
You have the doctrine based on moving the organization and individuals towards a pure state, untainted by the way the rest of the world operates. Scientology has 'clear', Zappos has 'teal' and 'self-management'.
You have the lingo that only people within the fold understand. Everything that everyone does is couched in terms that are invented by the group, or especially words that are redefined with specific meaning, creating a kind of dialect for group members that diverges from the mainstream. This makes it difficult for them to communicate with outsiders or leave the group, and also makes it difficult for outsiders to investigate and understand the group. Scientology has words like 'tones' and 'ethics' and 'holidays', Zappos has 'circles' and 'lead links' and 'roles' and 'distractions'.
You have people who don't fit (i.e, accept and submit to the doctrine and leadership) be driven out. If you're one of these people, it's treated as a personal failing on your part: you haven't haven't been willing to accept the doctrine, which is taken to be self-evidently correct and ideal, and cannot be allowed to taint the group. Scientology has its 'suppressives', and Zappos has 'the Beach'.
Are there more? Maybe. Am I just imagining them, and it's really no stranger than any other company that's a bit insular... like Apple for example? I don't know. But reading this article definitely tripped my 'cult' alarm.