At last, here's the droid we were all looking for. In this frame you can clearly see R2-D2's cameo in JJ Abrams' Star Trek. This time there's absolutely no doubt about it: It's been confirmed by ILM.
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Can you see him floating there, on the left, right below the huge arrow that I also missed when I saw the movie? That's obviously him, a fact that has been confirmed to me by one of the movie's sequence supervisors at Industrial Light & Magic—the same guy who said this previous sighting was just the shuttle.