thats an old outdated video
EDIT: plus we dont know the condition of that xbox, how much free space the HD had, whether or not its installed
EDIT 2: or if it was mentioned in another thread, ive forgotten sorry, but also dont know if a reload could have fixed the issue.
For the record: I've had my game do exactly what was shown in the video, here are the specs and conditions in which it occurred:
1) Game is NOT installed to hard drive: I play off the disc BECAUSE I've read in too many different places that playing off the hard drive makes your graphics look worse.
2) HD has 45 GB of free space. Surely that ought to be more than enough, yes?
3) Xbox is a Jasper, 3 years old, sits horizontally, has plenty of breathing room, temperature in the room its in never gets above 80 degrees.
4) Playing with the latest patch (1.4)
5) Reloading previous saves does not fix the "flickering".
6) Have never attempted to clear cache for any reason since I started playing Skyrim.
I've had what was shown in the video happen multiple times under the above conditions, the most memorable occurrence for me has to be Saarthal during the College of Winterhold questline, during which besides the crazy res show a chunk of wall completely disappeared and I was able to walk through it and ended up completely outside the dungeon. Reloading did not fix this.