The only time that would really be a concern is with small and close objects like planets, but even then they are so bright you only need a few seconds to a few minutes of video for a sufficient amount of light frames. Sure, Jupiter's moons might be slightly different from night to night, but there's no way you can see detailed change in its clouds in a few minutes time. As for DSOs, I'm pretty sure some of the nebulae we see today look almost exactly the same as they did a century ago (for amateur astronomers at least) because they are light years wide and many light years away. There's no way I would see a change even with several weeks worth of imaging sessions on some objects.
Stars twinkle.
Stars twinkle due to atmospheric refraction. In the same way that your TV combines RGB to make a multitude of colors, the combined light data from 1+ minute of video creates close approximation of the true color.
Wrong
several times during winter, I'd see the stars flash several colors, then they'd somehow all turn white and stop twinkling. I'd also see stars just get up and move around sometimes, at a brisk pace.
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