I managed to change the tv image and reflection light color, it was very easy and smooth.
I did it also in Create first to be sure and then here at Machinima,
I created a new camera and animated it, but as you can see from the video I linked above, the double click on camera keyframe makes the timeline cursor to jump to frame 155 !?
So strange - is this somekind of framerate interpolation error?
I have not changed anything else in the USD scene…