I think if it's a sub topic closely related to the main topic then it is okay, imagine you were the reader of this blog, would this interest you in respect to the rest of the blog focus?
Also, on my blog, I have written a couple of times about unrelated things, the blog has nothing to do with politics but I wrote about the last election, because it touched on a real personal issue for me and it was something I was passionate about and my readers were so touched that it started a long discussion in comments so sometimes it is okay to diverse, just NOT all the time.
I think sometimes posting about things that are important to you, even if a bit off topic sets up a personal touch with your readers and this, in my experience gets a big reaction, people want to get to know you the blogger and things you love, like being a pop culture nut, is one aspect of you. Make sense?
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