And one of those instances came in Peru and Denmark's stalemate.
The referee initially waved Peru's appeals away after Cueva appeared to be tripped by Poulsen but as play continued, the decision was being reviewed and the official eventually halted the action to point to the spot.
Yet he struck an bad penalty way over the bar, leaving the red-and-white clad Peru fans distraught, not to mention the crestfallen Cueva himself.
One of Peru's key attacking players' this World Cup, Christian Cueva had the flawless chance to give his side the lead just before half-time against Denmark.
And in the second-half, the midfielder could not find his way back into the game, looking void of some confidence following his penalty miss.
The win gives Denmark a good chance of qualifying for the knockout stages, and in Schmeichel they have a solid foundation on which they can build their hopes of going deep into the tournament.
FIFA World Cup 2018 Live Score, Denmark vs Peru: Denmark's Christian Eriksen has developed into the complete playmaker for club and country, and it was his hat-trick in a stunning 5-1 playoff demolition of Ireland that secured Denmark's berth at the World Cup.
"We have an advantage in the air - we're better in this department and have to make it count".
Authorities in Lima estimate around 25,000 fans flew to Russian Federation to see their team's return to the World Cup and Saransk was a sea of Peru shirts.
"They got very little out of this game, they probably deserved more, but that´s football".
They also gathered around the city's main cathedral, playing music and bringing a touch of the South American party spirit.
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