A goal in the second half from Ivan Perisic forced extra time, and Mandzukic's strike destroyed England's dream run short, as a team that surpassed expectations and has a bright future failed to really play well after the break.
The players in question, midfielders Dele Alli and Eric Dier, and forward Raheem Sterling, were seen wearing branded ankle support socks over their official Nike-branded socks during England's 2-0 quarter-final win over Sweden.
"I was there in France, in the Iceland game, and it was completely different to that", said Walker, recalling that chastening 2-1 defeat under Roy Hodgson. It's a young team, the majority of the players will play in the next World Cup with more experience at club level. But Kane said the team could "hold our heads held high" as they "went further than anybody thought".
"We gave it everything, I know we're gonna look back and say we could have done this and what but at the end of the day it was small margins in a big game and it didn't go our way today", said striker Kane, now the tournament's top scorer with six goals. It hurts, I don't know what else to say, it hurts.
The game went into extra-time but Croatia took the lead with a goal from Mario Mandzukic. We have to carry that on.
But the untelevised footage certainly showed the extent England were willing to go to score against Croatia to keep their World Cup hopes alive.
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Missing out on Champions League spots under Antonio Conte was a huge issue and we can not spend another year out of Europe's elite club competition.
Croatia face France in the World Cup final on Monday.
While Gareth Southgate's men have been praised for their style in Russia, Vrsaljko - who produced an excellent display at right-back - felt England became direct once his team got on top.
And another said: "I've not cried for a team for many years, lots of tears tonight. Everybody has come. It's the best feeling in a long time". Croatian midfielder Ivan Perisic rose into the air and with an acrobatic touch off his left foot, drilled the ball into the back of the net.
England will return to their Repino base near Saint Petersburg ahead of Saturday´s third place play-off against Belgium, a repeat of their final group match.
Although Walker described the players as "absolutely gutted" to miss out on a place in the World Cup final, he said they could take great encouragement from the emotional scenes at the end of Wednesday night's defeat against Croatia, when England fans showed their respect for the team's performances in Russian Federation by staying behind to applaud the players and singing their names.