ad 1. i don't think you're doing the officials justice here. huntingyou points to very important, very real reasons not to use Hawkeye: 1) the raised lines actually increase the margin of error of the system and 2) the very real potential of a clear mark proving hawk-eye wrong could undermine the credibility of the system, even on other surfaces (problematic, given that decisions are actually very often closer even than the system's usualy margin of error).
ad 2. it was a whole lot like that (in)famous bh indeed. a simple mistake; just shows how big the pressure in such points is.
now, if we actually want debate - how about the (not) watering of the court? unlike the "two most important points", this seemed to actually be an issue for Novak.
i do think they were right on this one as well. tampering with the surface in the deciding set, when at each changeover someone's got a chance to end the match - just can't do it; of course, the issue might have become problematic if they'd gone to 10 all or something; strangely enough, it would almost make more sense to do it with an extra break at an even score - because it's the only way to guarantee at least two more games and a change of sides before it's over.
again - for this match, while i don't blame Novak, i don't think he was right either. it really didn't look unsafe, they moved pretty well up until the end. clay can get slippery - it's simple as that. if it's wet-ish, noone has the chance to ask for blow-driers either, so it's fair play as long as the health of the players isn't jeopardized. i think just like Madrid showed, people tend to easily call a surface "unplayable/health hazard" when really, they mean "not good for my game".