The blunder by Ter Stegen for Cameroon's goal should concern Loew.
The Indomitable Lions also had Ernest Mabouka sent off after confusion involving the Video Assistant Referee.
Germany finished top of the Group on seven points followed by Chile who played 1-1 with Australia.
Colombian referee Wilmar Roldan showed Sebastien Siani the red card at first, before his error was rectified and Mabouka received his marching orders instead, after intervention from the VAR.
Liverpool midfielder Can, who helped Germany navigate the group stage with relative ease, told reporters: "We have a young squad, but if you come as world champions to the tournament, I think you are favourite".
Cristiano Ronaldo says he and his Portugal team-mates are ready for their Confederations Cup semi-final showdown with Chile on Wednesday night.
Their best first-half chance fell to Andre-Frank Zambo Anguissa, whose side-footed volley following Mabouka's cross was well saved by Ter Stegen just before half-time.
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There have been none so seismic in his tenure, however, as the 7-1 demolition of hosts Brazil in the 2014 World Cup semi-final.
"We wanted to get out of the group and we haven't, so we are disappointed", said Postecoglou.
"They are an uncomfortable opponent, similar to Chile".
"We did not have the precision of other matches. but we are satisfied with having fulfilled the first objective of this championship", said Chilean national team coach Juan Antonio Pizzi. "The team's character and temperament is to always try and create scoring chances", he said before the start of the tournament.
One particularly hard challenge from Tim Cahill left Chile midfielder Charles Aranguiz in pain and he was substituted at half-time.
Alexis Sanchez appealed for a penalty in the 26th when he went down in the penalty area following Mark Milligan's desperate lunge, but the video review system said no foul.
James Troisi had Robbie Kruse partly to thank for the opener.
They paid for those misses when Rodriguez turned the ball in from Eduardo Vargas' header after the Australia defender failed to clear an attack.