Cool videos. They have an eye for production. Noticed that they flipped the image horizontally of the Graupner Trx at 0:41 into the 2nd video. I wondered why, so I played it back at full speed and figured the reason was to make a distinct cut/transition from the shot of the first controller to the shot of the 2nd.
It is a quick-enough cut that most would never notice, but I just happened to pause the video to look at which transmitters they were using, and that's when I noticed all of the text on the 2nd transmitter was backwards.
Reminds me of short films/videos from my time at college. Fun times! Their reaction when they figure out the bag dropped and where it landed is perfect.