What I love most about this movie is the bouncy music, bright color & joyful cheesiness; the filmmakers really put a lot into delivering a movie-lover's version of the retro eras depicted.
What makes me most sad is that--and this is based upon the fact the three stories take place a mere 50 years apart--our first two sets of protagonists must have died horribly young!
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Lead actor Akshay Kumar plays two characters, one of whom has faked his death in a flash-forward scene, and one of whom (not necessarily the other) dies (or fakes it) later on in the action.
It doesn't matter if you are confused now or during the watching of the film, or even whether you can recall any of what happened later--because the goings-on are that much fun to watch.