Of course the bluetooths were not visible on Cap, BW or anyone else, really. It looked more like they magically talked to each other. And yes, I noticed that it looks like the Avengers only stayed on a single street. Pretty damn obvious.
I also wonder why Stark didn't take "Legolas" to the top of the tower to deactivate the portal; when BW went there in a much riskier fashion they were no closer to figuring out how to close it anyway.
Also, this is a separate point, but all the Avengers spent an inordinate amount of time trying to figure out where the tesseract was, when it was obvious that it would be Stark's tower