Flaw spotted.


When Colin played tennis in the alternate reality he didn't do very well because in his reality he didn't play tennis twice a week and was physically unfit. This leads us to believe that he was still inhabiting his own body!? And since the two realities diverged more than 25 years ago thats more than 25 years of possible differences between the two alternate bodies – scars, moles, skin tone, hair – could and probably would have all been different and would have been noticed. If the writer of this film had thought about this is it could have made for some comic moments in the story. [I'm sure its been exploited in similar films I've seen]

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You've got to get out more!

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Mental attitude would be quite important. Physicist-Colin might be physically capable of playing the game, but would be nowhere near as mentally prepared and alert as alternate-Martin, who has been playing regularly. It is also quite probable that both Colins had similar styles of play, even with different levels of practice, and alternate-Martin would know these styles quite well. Physicist-Colin, on the other hand, would have no knowledge of alternate-Martin's game.

But there is a clear sign that physicist-Colin was clearly inhabiting the body of novelist-Colin: note that physicist-Colin always wore spectacles, which novelist-Colin had no need for. This is unlike the 1971 adaptation, where Colin's body does shift (much less credibly in my opinion).

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But surely if Colin was inhabiting the alternate guy's body he would also inhabit his brain and thus his memories? In fact he should be oblivious as he would feel no different to the person he replaced, since his brain is the same.

Which all leads me to believe that he was still inhabiting his old body in the alternate realm, and the spectacles may be a result of too much studying (I imagine due to scientific research).

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