I'm still not sure about Mr. Robot. What about the bartender? I suppose the evidence is pointing to him being in Elliot's imagination but there are a few discrepancies.
Bartender never speaks to him or serves him...
and look at his reaction when Elliot orders an apple-tini..like its the FIRST TIME someone ordered it...
if Mr. Robot existed he would have made some mention or motion to the fact that he just ordered the same drink.
And IF Mr. Robot dint exist entirely in his mind...bartender would have asked if Elliot wanted the SAME or a refill.