Yes, yes there are. TrackCoach is right. There may be tactical reasons to run even or negative split at times, but physiologically a slight positive split is optimal. The fastest performances have shown this repeatedly. This is different from most other race distances. It has to do with how the 800 is uniquely reliant on both anaerobic and aerobic systems.
True. And great 800m runners do frequently go out too fast. Or too slow. Or press too much in the middle. Or relax too much in the middle. The 800 is incredibly difficult to pace perfectly.
No. You're wrong. Classic LD thinking. The 800 is different.