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You'd have to be more than "eagle-eyed" to see R2 in the Star Trek image, but apparently he is there thanks to ILM who did the special effects ...
R2-D2's secret Star Trek appearance
The makers of the recent Star Trek movie have confirmed that R2-D2 makes a secret cameo in the film.
R2D2 in Star Trek
Eagle-eyed owners of the just-released DVD noticed that the Star Wars character makes a blink-and-you’ll-miss-it appearance during a battle scene, where he can be spotted through a hole in the bomb-damaged Starship Enterprise.
It turns out that R2-D2’s guest spot is something of a recurring theme of films featuring the handiwork of Industrial Light & Magic, the special effects company owned by Star Wars creator George Lucas, with the robot also having recently cropped up in Transformers: Revenge of the Fallen.
R2D2 in Transformers