People who started watching World Cups recently might not know why the final round of the group stage (teams are split into groups of four, and in the group stage, each team plays the other three in its group) consists of two simultaneous games. It's because the Argies are a bunch of dirty cheaters. Not in this last edition - I consider that title completely legit. But they stole the crap out of their first title in 1978.
In '78, there were fewer teams - 16 instead of the 32 from the last several (and it's going up to 48 in 2026, making the qualifiers as irrelevant as the NBA and NHL regular seasons). In '78, there were two group stages - one with four groups of four, and then a second with two groups of four constructed from the top two teams from each of the groups from the first group stage. The winners of the two second-group-stage groups advanced to the final, and the second-place teams went to the third-place match. In the second group stage, both the host Argentina and their arch-rival Brazil ended up in group B. Brazil won its first game 3-0 and Argentina won its first game 2-0. The two teams then battled to a 0-0 draw, so going into the final round of the second group phase, both teams had three points. Brazil's third game was held before Argentina's, and Brazil won it 3-1. So Brazil then had six points and a goal difference of +5.
The Argies took the field against Peru later knowing they had to win by four goals or more to advance. More than that, the Argentine military dictatorship government knew it as soon as Brazil's game ended, and communicated with the military dictatorship government of Peru. Huge payments were made to Peru from Argentina's ministry of agriculture, and Argentina took some of Peru's political prisoners. The result: the Argie-born Peruvian goalie and his team lost 6-0, which, especially at that time, was something like a 77-0 score in gridiron football (or, say, 164-30 in an NBA game). Argentina advanced to the final and Brazil was forced into the third-place match without having lost a single game in the World Cup.
In the next World Cup, in Spain in '82, the group-stage crap continued as Algeria was eliminated when Austria and Germany went into their final game knowing that if Germany won by one or two goals, both teams would advance and Algeria would be out. Germany won 1-0 and there were widespread accusations that the Germans and Austrians had fixed the result (unproven, as far as I know, unlike the case of the Argies and Peruvians, to which some of those responsible ended up admitting back in the aughts).
After that, FIFA changed the rules and made it so the final two games of the group-stage "round robins" were held simultaneously to avoid Argie-style cheating in World Cups.
You'd think the NFL would take the same care 40 years later, but you'd be wrong.