Yeah, artistically it was nice, but factually it was sort of bleh. I'm just an average guy but here's my thoughts on inaccuracies:
* Stars don't really break up into big rocky chunks
* Voyager probe would be so far away after 4 billion years it wouldn't be in the neighborhood. (if it went in a straight line, possibly up to 300 ly away)
* The galaxy may have reconstituted itself into another shape, (although stars are so far apart from each other, would it really matter)
* The material that makes up voyager probably has turned into a powder way before that - charged particles over billions of years probably have pulverized the frame into a small clod of dust traveling through space.
* Dispersal of star happened too fast, relative to size.
* Everyone knows the probe gets picked up by aliens and returns to earth to save the whales some time in the future. DUH!
You will never see anything shown in that video happen, it was so scientifically inaccurate that it was actually painful to watch. The only reason I didn't say anything was that they were very up front about disregarding scientific accuracy in favor of artistic expression, so I can't really hold it against them.