Edson Alvarez was brought in as centre back for Mexico's World Cup Group F game against South Korea on Saturday in the only change made by coach Jose Luis Osorio after the Latin Americans defeated defending champions Germany.
Mexico carried their momentum from an earthquake-inducing performance on Day One, to their fixture against two-time Asian Cup champs South Korea.
A win on the final matchday against Sweden would ensure Mexico finishes atop the group, and if Germany beats Sweden on Saturday as expected, a draw would also be enough for El Tri. It almost paid off after Hirving Lozano out-sprinted his marker, but his final delivery was blocked away.
Vela was made to wait by goalkeeper Jo Hyeon-woo, who played for time by swigging his water and chatting to his team-mates, but there was no mistake. Chicharito bagged his 50th goal in worldwide play on a counter-attack led by breakout star Hirving Lozano - but Mexico was only able to score because referee Milorad Mazic allowed play to continue after Hector Herrera fouled Ki Sung-yueng to gain possession.
South Korea threatened again nine minutes later, Son breaking clear of Mexico's line before letting rip with a low drive that Hector Moreno did well to keep out.
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Of Carlson's comments, MacFarlane tweeted, "In other words, don't think critically, don't consult multiple news sources, and in general, don't use your brain".
Vela nearly turned provider two minutes later with a neat ball into Layun, but the former Watford man lashed his effort over from close range.
Ki Sung-yueng was the next to test Mexico's resolve, stinging the palms of Guillermo Ochoa with a rasping first-time strike.
Son Heung-min's stunning long-range effort in stoppage time gave South Korea a glimmer of hope but it was too little too late. South Korea responded with fouls. The Koreans have not won a World Cup match since the opener of the 2010 tournament in South Africa.
Just as South Korea were beginning to grow in confidence they fell behind.
Hernandez added the second in the 66th, scoring his 50th goal for Mexico.