Why "got" was used here? What does it refer to?
Native speaker’s answer
Rebecca
The word "got" in this context is paired with "has" since "it's" can be a contraction of "it has". So the full phrase here is "has got" which means to "have" in the past tense. This refers to the show "Friends" having a total of ten DVDs. Ex: She's got three cats. Ex: I have got four kids.