Too many to enumerate; a book could be written but it wouldn't stay current for very long.
Experience. Eventually you'll see most of the shady things, or omissions, they leave out for various reasons (anything from lazy to malicious).
Figure out which parameters you're looking for every time, and try to spot them -- they're usually named consistently but sometimes they use different symbols, or only give the name/description not the symbol, or...
Watch for erroneous units. Siemens when they mean seconds is common enough to ignore, but sometimes you'll see V copy-pasted down a column when it's supposed to be uA, or maybe nC when it should be pC or vice versa... etc.
Be careful about characteristics, especially with things like inductors and capacitors. Caps, the loss isn't usually a problem as long as you're using the right type (electrolytic ain't never gonna do a resonant circuit, etc.), but there are cases where you need to know the current or voltage limits vs. frequency (maximize VARs for a compact/affordable resonant supply?). Likewise inductors, saturation is often either soft or abrupt with current (powder and ferrite materials respectively) so it pays to know how much you can run at for a given value, and the Q factor varies more dramatically with frequency (inductors generally have poorer Q than capacitors anyway so they're both more variable and more critical in the circuit overall).
Tim
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