Haha! The so called 'secret' ending is where all of the beatles hate me, nothing to do with the card game. For the How to's; pick the options that are obviously the ones that will piss them off! Though you do need to follow George and Ringo first
That 'ending' is where all of the beatles hate you, pick the options that they'd all be pissed at, butchering John, taking your hand off Paul, calling Ringo the Ugly Beatle™, those options!