Not saying they couldn't have come in a Challenger but IMHO, I dont think they did.
Those promo films always have a lot of goofy things, mistakes and items from other vehicles.
It is showcasing the 71 Challenger, but when showing shifter options about 4:20 shows a 71 B-body non console mid length shifter.
The car clearly has a 1970 dash pad as seen by stitching and 1970 Challenger script on right side.
It clearly has 1970 mirrors.
The cassette face is not like any production cassette player, larger tape opening, almost 8 track size.
Which leads me to believe they stuck a Barracuda horn pad on the rimblow wheel
Parts books rimblow cap shows this one only listed B for Barracuda, no BJ for both.
J for Challenger cap has the different part number
A factory original aluminum Dodge ring for cap has the DODGE letters embossed.
In my opinion it was the same used for both years.
Letters may have been black on a brand new model car but many originals I have seen including my original is clear, ....but perhaps from wear.
Anything that is not embossed would be a reproduction.
Dale Tuel was the first to make a reproduction of it many years ago and although his letters were embossed they were slightly larger than original.
I have not held a current reproduction DODGE cap ring in my hand to compare to original.