I didn't have time to watch the video, but I believe the film was similar to Magnavox Odyssey's plastic films you could change to each game - and quite frankly, this is how Game & Watch had it's backqrounds made into different games.
https://gamicus.fandom.com/wiki/Magnavox_Odyssey
Ei Kiinasti.
Eikä Japanisti.
Vaan pannaan jalalla koreasti.
Nintendo games sell only on Nintendo system.