One thing that is important to understand is that the new synths are more limited than original synths as far as shooting the scene however you want and stopping and looking off to the side of the road is not what a new 'walk' synth expects.
This does seem to be a particularly mangled reconstruction, though.
When you have the synth loaded, click or tap anywhere on it and type the [M] key to show an overhead map of the reconstructed camera positions.
You can also use the [C] key and then zoom out to see the camera positions in 3D.
Good question about the resolution of the time signature considered by Photosynth.
Photosynth team, what can you tell us?