The problem is that the stars on the shirt are for World Cups, Uruguay claims that FIFA specified the Olympic tournament (before the first World Cup in 1930) as equivalent of a “World tournament title” and thus it counts, other countries disagree and use those two “Olympic” stars (they also won in 1928) to make some (usually gentle) fun of them.
The backdrop is frequently undecorated street furniture, concrete and graffiti. When London had it in 2012 every street light had a flag on it - even in the outer suburbs. Here I can spot ugly undecorated lamp posts in the background of the opening ceremony! Bit underwhelmed at the moment but hopefully as it gets darker there will be something a bit more spectacular. The Eiffel Tower is always a lovely sight when it’s lit up.