Until I realized what the movie actually was, I was seriously wondering where all this was going, and suddenly the title made so much sense at the end.
Everything you see in the film is just a fantasy, not only from the director, but also the characters (which is why, though initially miffed, I ended up not taking Cliff's 'memory' of Bruce Lee seriously).
Everyone was really top of their game, from acting to directing to photography and editing.
Once you realize what the film is and that it isn't just a Tarentino self serving vanity project (though it also is that of course), then you can really enjoy the film and both have fun and marvel at the beauty of the craft.
(I realized it was complete fantasy land when Cliff's ranch owner buddy turned out to be exactly what he was described by the Manson girl instead of the dreaded tortured/ dead old man you expect, though there are many hints beforehand).
I also found a very interesting and biting critic of 1970s era Hollywood under the love letter, which was very welcome (if you look at it with things meaning the opposite of what is shown, then it makes sense, from Pitt refusing service from an underaged girl, to the crew coming to the defense of Bruce Lee in a possibly thinly veiled racist brawl, to Hollywood having blackballed a man suspected of killing his wife -nod to Richard Wagner-, to a non exploited and very mature 8 year old girl flourishing in the film industry, to a Playboy mansion devoid of sex and drugs with a very self aware Steve McQueen... and Countless more exemples).
