Unlike some of the time-travel movies I love like 'Primer' or '12 Monkeys ' 'Looper' is not about time travel. It's about this situation that time travel creates and the people dealing with that situation. So narratively the big challenge was to have time travel get out of the way.
However I had a chance encounter with an admissions officer of Stevens Institute of Technology who so impressed me by his erudition and enthusiasm for the school that I changed course and entered Stevens Institute.