It was England's last warm-up match before kick-off at Russian Federation 2018 and, while the Burnley number one starts the summer as third-choice behind Butland and Everton's Jordan Pickford, he has hailed the competition between the shot-stoppers.
We hear from the England manager as well as Jordan Henderson and Trent Alexander-Arnold who reflects on his debut.
In the opening half, with Manchester United forward Rashford influential in the inside-left role, England showed their pace and comfort on the ball but after the interval the game became slower and much less interesting. However, Southgate insisted the 20-year-old needs to express himself and feel the freedom to make mistakes.
"I probably caught it too well", he said.
"He called me to ask if I would be happy to be on standby".
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But again, I'm not going to speak for other teams. "The people love you, the people of our country love you". Some of Pennsylvania's Democratic lawmakers also weighed in.
"He made 10 changes for the Costa Rica game and you saw an identical performance to the one against Nigeria".
He picked the ball up 25 yards from goal and unleashed an unstoppable, angled drive which left serial Champions League victor Navas flapping at thin air.
However, there was a gulf in skill between England and Costa Rica, despite the fact that Southgate's lineup for the match was largely second string. Navas kept his side in the game by denying Vardy from point-blank range as he latched onto Leicester team-mate Harry Maguire's knockdown.
Substitute Welbeck made certain of the win 14 minutes from time, though, diving to head home Dele Alli's cross, as England earned a vociferous send-off from the Leeds crowd before their opening match in Russian Federation against Tunisia on June 18.
It was a welcome boost for the European champions, who hadn't won since March and were held to draws by Tunisia (2-2) and Belgium (0-0) in their previous two friendlies.
And his very presence sparked a marked improvement in Portugal's attacking thrust as he was involved in nearly every unsafe move the hosts conjured until he was replaced on 74 minutes.
In 2014, Costa Rica practically shocked the world as they topped their World Cup group ahead of Uruguay, Italy and Thursday night's opponents England. Algeria did not qualify.