first of all, nobody is perfect. you can't deny everything they find just b/c they make mistakes. and the ones that come up with fakes are dismissed by the scientific community; they end up not changing anything.
second, there is no such thing as a scientific failure, and that is why they won't admit a failure. to put in the words of thomas jefferson [not the exact quote, but it's along these lines.] "when i tried 70 ways to make a lightbulb and they didn't work, it wasn't a failed experiment. i just found 70 ways not to make a light bulb. so i was one way closer"
the story has changed b/c scientists have never taken one idea and said "this is how it is and always will be". the purpose of science means being open to being flexible about your theories based on actual evidence.
example: if you have REAL EVIDENCE to think trees are going to fall down in 3 days, and the next day it turns out you have new evidence that says 5 days instead, then that's just b/c they took their study one step further and corrected themselves.
also, science doesn't take what one guy says and just believe it. religion does. science takes the collective of lots of professionals and tests a hypothesis in a controlled experiment over and over and over until all of them together come to the common conclusion that under those circumstances, that is always going to happen.
and evolutionists don't randomly just take species out of the chain or anything. they may change things around when they make a new DISCOVERY about their genes, or a new species discovered that should be in the place they are, or any variety of circumstances. even if you have the ability perfectly date bones. you still have to explore the specifics about the bones... the developement... comparing everything. things might bet mismatched. things may not get discovered for a long time. not long ago was it that scientists finally found the only difference between the Neanderthal and human skulls, which would be the placement of the vocal chords., resulting in finally having our first reasonable hypothesis as to why they are the species that failed [they couldn't communicate as well where their voicebox was]
lastly, if scientists of any kind ever found any proof, evidence, anything that even slightly indicated to god's existence, then it would be widely investigated. if many scientists agreed on it, then god would be scientifically accepted. but they haven't, so he's not. science doesn't base it's beliefs on 2000 year old men's imagination. it bases things on physical evidence.
one last thing... there were crocodiles in the time of dinosaurs, so with their dating could be easily mistaken.
also, what does apes living at the same time have to do with proving/disproving evolution? they still live smartass. evolution doesnt mean when a new species comes along, the one before it is just gone. if that's how it worked, we would only have one species on the whole planet.