Can I be the first to say those green and gold flags are by far the best variation on red and yellow we've ever seen? Just putting it out there.
I'm living in Vietnam and I was thrilled to know that they race in my own country, I live in Ho Chi Minh City
You can see that all the flags mostly in Vietnam when you watched TAR10, TAR15, TARA3, TARI and this, they were coloured white & yellow or green & yellow in order to avoid confusion with the flag of the vanquished South Vietnam, which is red flag with one yellow star in the middle
I can't wait for the next episode to air in Vietnam, you can see in the preview and the promo, the place where they receive clue from the lady wearing "áo dài" (which is our traditional outfit in Vietnam) is our city theatre, called Saigon Opera House, a very famous place in Ho Chi Minh City