In the dream sequence early in the film, Hank's hose is made weightless by a string, and Paxton's glove is pulled off by another one. You can see them.
The director, Ron Howard, notes on the DVD commentary that the dream sequence was shot specifically to look unreal (because it was a dream). To get this effect, the scene was shot on the ground using traditional movie-making tricks to mimic zero g - it definitely was not shot in the "vomit comet". When compared to the "real" zero g scenes, I think it achieves the faked look that was intended.
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None of the weightless scenes were shot using strings, as far as I know. I haven't been able to go back and watch the scene, but I know that most of the weightlessness scenes were actually shot in zero-g on NASA's specially modified KC-135 tanker, lovingly known as the "Vomit Comet".
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