Aside from many things already mentioned (single biome planets, always class warfare, always humanoid aliens, the universal translator, technobabble), it really irks me whenever "lasers" work as slow-moving discrete "bullets of light". That ain't how lasers work, dammit!
And "asteroid thickets". Seriously, asteroid fields don't tend to be that dense.
Oh, and the annoying "This is Earth" ending. How original...
Explosions in space. A vessel that was moving at some funky speed explodes, and the explosion is stationary? What? Planar shockwaves around space explosions? Seriously? Explosions in the vacuum of space being noisy? Come the hell on! Not to say anything about how explosions in space should be pretty much spherical.
A distinct lack of Kessler Syndrome around planets where ships often blow each other up also bothers me.
And "asteroid thickets". Seriously, asteroid fields don't tend to be that dense.
Oh, and the annoying "This is Earth" ending. How original...
Explosions in space. A vessel that was moving at some funky speed explodes, and the explosion is stationary? What? Planar shockwaves around space explosions? Seriously? Explosions in the vacuum of space being noisy? Come the hell on! Not to say anything about how explosions in space should be pretty much spherical.
A distinct lack of Kessler Syndrome around planets where ships often blow each other up also bothers me.