I would say that the two main aspects of Epicurean philosophy is the materialist worldview and its telos.
This is obvious, but will say it anyway: We don't believe in a materialist worldview and the goal of pleasure because Epicurus said so, but instead we believe this system of thought is correct because we understand the reasons to do so.
Correct understanding helps prevent unnecessary eclecticism.
Another danger is the temptation to extrapolate ideas and taking them out of context from the original text (probably guilty of this myself occasionally). These deviations over time can lead to problems (obviously). This is why I think being consistent with the framework of the philosophy is so important.