I agree with Commonsensemedia's review, but I just don't think that eight-year-olds would be that interested. I may be stereotyping, but most eight-year-olds I've met can hardly sit through a Disney movie, let alone a feature-length ad for the Beatles.
Too much sex: The grandfather of one of the members of the band was described as 'sex obsessed' and tells a woman that she'd be good at swimming (referring to her breasts, which you can see, simply because she is leaning over, although it will probably go over many children's heads, I got it simply because my friends are... a bit interesting.)
Too much smoking: There is a lot of smoking, but you may want to explain to your child that, in that era, it was considered the height of 'coolness' to smoke. It was expected of people then.
Great role models: The members of the Beatles have a good sense of humor that is sometimes a little iffy- they make fun of a band member's ears (or was it nose..?) and are sometimes a bit rude to people older than them, which is admittedly a bad influence but it is for humor purposes, and it's all in good fun. You can really tell that they care about their audience and fans. (side not, there are several occasions in which fans, or members of the band, fall violently on their faces, they get up again immediately but it does look very painful.)