I'll say this again: Star Wars doesn't have surveillance tech as prolific as modern-day RL. They don't readily have CSI labs that go to work on every little thing happening in the Outer Rim (and killing a half dozen nobodies is still a little thing in the SW universe). While CC cameras are certainly around, they are typically obvious and record on-site. Remember that the baseline tech of this setting is reskinned 70s/80s where starships = automobiles and blasters = firearms. Other elements, like lightsabers and bacta better resemble magic. However, this is not the place for ultra-tech miracles pulled out of Star Trek, nor even of modern cutting edge forensics (consider how hard it was to track down the crew of the MF after it was identified as having been resposible for the destruction of the Death Star).
Depending on how deep down the EU rabbit hole one wishes to go, I would like to point out some information I have come across. In several instances in the early Rogues squadron series Whistler (an astromech fitted with enhanced software in order to assist capturing criminals) was called upon to replay video/data he had captured from up to several decades ago. He was originally from CORSEC, and if they would have access to this technology, then Imperial Intelligence probably would as well. Given the nature of and interdependance on droid labor/services I think it would be very reasonable to assume there are recording devices in many places, such as traffic control cameras, orbital facilities, even mesenger droids could capture data. It would just be a matter of putting all of the pieces together.
That's true. They mostly just use holo technology, which doesn't even have color (and its resolution is pretty crap). Their computer technology and our's is completely different. Pretty much everything is black base screen with a few colors (remember the view of the Death Star approaching Yavin?) or holo-projections.
I believe that is more because the original 3 were filmed in the 70's 80's than because that was a purposeful representation of the tech.