England led twice in Cologne on Tuesday night through Joe Cole and Steven Gerrard but were pegged back via Marcus Allback and Henrik Larsson - both goals from set-pieces.
Robbo was also forced to make one superb save from a corner that flicked up onto the crossbar, Olof Mellberg struck the bar and Gerrard cleared off the line from Kim Kallstrom.
However, it all worked out as the draw secured England's place at the top of Group B and a second round tie against Ecuador on Sunday.
"We conceded two goals from set-pieces," said Robbo. "We do work a lot on those and we have to look at it.
"We will look at the goals because we didn't defend particularly well. But we have a few days to put it right.
"I thought we played very well in the first half. It was the first time we have been able to go out and play and we wanted to go out and keep the momentum going.
"We have been disappointed in our second-half performances, but the bigger disappointment here was that we didn't kill the game off.
"Paraguay and Trinidad & Tobago defended and it has been difficult, but this was a good game. We've picked up injuries, but overall we are pleased with the performance and pleased with the result."
Paul Robinson accepts that England will have to sharpen up on set-pieces after Tuesday's 2-2 draw against Sweden.