Ziz said:

There was also a continuity goof you made. Right at the beginning during the exchange between Luke and Rogue Two, the flap closes while Rogue Two says his line, then when it cuts to Luke's "Set harpoons" line, the flap is open again. Then the next shot - the tracking one behind both speeders - the flap is on Rogue 2 is closed.

As Angel said this is only a proof of concept, but I'm not using that as a 'get out of jail free card', If you can play the clip frame by frame, which is hard in youtube (unless you download it) you can see that after Rogue Two says his line and it cuts back to Luke, the flap is actually closed and is opening again.

The next goof you say is between the speeder model from the side of Rogue Two to the tracking shot of behind, which I wasn't trying to demonstrate.