It is nice to have a video of some of the less visited spots. Here are just a few points to expand on your commentary.
The colored flag you saw across Rock Creek is not on the ruins of the Taney Farm. The ruins are further up hill from the Creek.
It is correct that the 20th Maine spent the night of July 2 on Big Round Top, but did not stay for the whole day on July 3. About noon (according to Chamberlain's OR report) they moved with the rest of the brigade to a position that he describes as being along the edge of some woods behind the left center of the Union line. However, unlike the impression one gets from the movie "Gettysburg" and the "Killer Angels" book, they were not at all involved in the repulse of Pickett's Charge.
I see that you have already learned that the panorama you provided near the end of the video was taken from the Timbers Farm. You may want to note that at the time of the battle the farm was owned by George W. Weikert. George and his family left during the fighting, and returned to find severe damage to their crops, buildings and fences. George sold the farm to James Timbers (a black farmer) in 1868. When the Warren Map was being prepared, the surveyors did not know the name of the owner at the time of the battle, so they simple called the farm by the name of the then current owner, "Timbers".
In case you are taking suggestions for future ventures, the National Park Service owns the land west of Willoughby Run that was once a country club. If you head west on Chambersburg Pike (US 30), take the first left after Willoughby Run onto Country Club Lane. Just before the end of Country Club Lane at Old Mill Road, you will see a small, dirt parking lot on the left. You can leave your car there and follow the paths that appear to be old golf cart paths and head yourself north and east to find Willoughby Run. There are no monuments, but it is interesting to get feel for the ground where Heth's Division, and later Pender's formed for their attacks on July 1. You can walk along Willoughby Run, and when you see the McPherson quarry across from you, you can imagine that it was likely in this area where Gen. Archer was captured.
Enjoy, and keep posting the videos.