Even if one accepts time travel, him being present at this beach party would mean that he knew her before he knew her, and is a horrible paradox. Moreover, it was absolutely unnecessary to the story!
a) Self-consistency (re: Time Travel; multi-verse) suggests that the macro catalyst are always met--no matter how many micro-changes occur. And as such, Ruby's "Man Hand Photo" is the macro catalyst. Whether the "hand" in that photo is Sam or not is micro.
Expanding, the original photo that sends year2470-Sam back in time may display the hand of a different man entirely (micro change; catalyst met). Thusly, year2000-Sam has traveled back within the causal loop and supplanted the man with his own hand. Self-consistently.
Self-consistency also solves the Grandfather Paradox outright! Go back in time and slay your grandfather? No problem, wasn't your actual grandfather in the first place. Your grandmother boinked the mailman. Go back in time and slay him, too? Oh snap, you were secretly adopted.
Or...
b) The hands are always Sam's. But we are not witnessing the original Sam. No, instead, we're neck-deep in the unfolding causal loop. Maybe even the millionth iteration. So, from this perspective, we're too incredible far from the original catalyst to know if it was even a photo in the first place.
Expanding, Sam-0* travels back in time to escape some great failure/jail in his present (might not even be 2470), Sam-1** meddles with the past for the first time, changing the catalyst for Sam-2***'s jump backwards... Enter the audience, Sam-2,299,100 finds Ruby's photo with Sam-2,299,099's hand in it. And the movie (more or less) begins.
(* Sam-0 belongs to a reality where his own reality was not yet effected by his later temporal hijinks. The Prime Sam.)
(** Sam-1 is Sam-0 *after* the jump backwards in time. Instantly effected both himself and all Sam's not called Sam-0)
(*** Sam-2 is an entirely NEW Sam, born in ~2440, *after* Sam-0 jumped back. This is a Sam born within the reality Sam-1 existed centuries ago. Sam-2 will jump back, maybe, becoming Sam-3. And so on. Sam-1,420 is born 400 years later, sees Sam-1,419's hand and becomes Sam-1,421 after the jump back. ZERO is the first-timer. 1 is the first time-traveler. 2 is first-born after any time-travel. And from there; all EVEN# denote [born in the future] and all ODD# denote time-traveler.)
...
Paradox free.
messageboard rules are serious business. like really serious.
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