This kind of film is purely four different, saying that he is a documentary, the characters are fictitious, and that he is a comedy, although there are spoof elements, but it is not laughable; to say that it is a drama, the plot is obviously nonsense. The only interesting section is the section that David and Beatles discussed in India, and there is also a cartoon that clearly refers to "yellow submarine", and the section about Elvis is not on the ground.
The nonsensical is almost exaggerated, it is hard to look like this is a biography (virtual), but when you insist on watching it, you will find that this is a movie that makes people laugh with tears.
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Walk Hard: The Dewey Cox Story reviews