The first football world cup final was won by Uruguay against Argentina 4:2. What was unusual about that game?

There was no half-time break
There was no referee
5 players got red cards
Two different balls were used
Two different balls were used in the final: Argentina supplied the first-half ball (the 'Tiento') and led 2–1 at the break; hosts Uruguay supplied the second-half ball (the 'T-Model', which was larger and heavier; see photo) and won 4–2.
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Illustration: Ben Sutherland