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The one heart rate thing that I kind of do believe is that during labor, girls heart rates are higher. During my last labor, with my DS2, his heart rate stayed basically in the 120's-130's. I don't know the heart rates of my other 3 kids during their labors, though (I can't remember if I even noticed).
Like a previous post said, during pregnancy I think it really does depend on what the baby is doing. I was monitored a few weeks before DS2 was born, and his heart rate went from 120 all the way up to 170, depending on if he was moving around or sleeping.
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DS' heartrate was always around 160-170!