Continuity mistake: When Jyn meets Saw, in most shots the hose for his mask is well through the loop on his suit, but in one closeup shot the mask is right up against the hose, then jumps back. (00:40:00)
Continuity mistake: When Galen and Krennic are talking at the farm, in some shots the wind is very strong, judging by Krennic's cape and Galen's hair. In others there's virtually no wind at all. This changes immediately between shots, there's no time for the wind to swell or fade. (00:03:30)
Answer: Princess Leia is not being chased by Vader's ship until after the events of this movie. The entire fleet heads off to Scarif, and she picks up C3PO and R2 off-camera. At the battle on Scarif, we see the mothership get boarded by Darth Vader, and then we see the smaller ship make their escape. That ship contains Princess Leia and the two droids, which is subsequently being chased at the beginning of Episode IV.
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