Yes, that poor cabbie was dead as soon as he looked pathetically pleased to see Carrie, and mentioned that he was studying for an MBA. It's the Homeland equivalent of being the slightly chubby, goofy soldier who produces a photograph of his sweetheart in the first ten minutes of trench warfare and is promptly offed in the middle of a speech about how Annie is waiting for him at home, and they're going to have a cottage with roses over the door. 
Jonas's horror at how much blood Carrie has on her hands is pretty apt, actually.
And whoever said Carrie really needs to work on her 'unobtrusive fast walk' is absolutely right - she does this mad speeded-up fast waddle that looks a bit like race-walking, which would make her stick out a mile anywhere, even leaving aside the Unconvincing Brunette Wig or the Stand-Out Silky Blonde Locks.
And do we think that Hair is planning to kill Carrie herself, or put her nasty squeeze Ivan onto her? If she's planning to do it herself (because let's face it, the Russians have been a bit crap about murdering Carrie to date!), will she take off her high heels and rather nice pencil skirts and silk blouses? If I were an double-crossing CIA station chief regularly going to the same safe house to meet a Russian spy, I'd be doing it in clothes I could run in...