Have to so totally disagree with the people who think that Jack/Ennis were checking each other out in a sexual sense. Grew up in that era, and that was not done unless you wanted to get physically hurt. Again, you are putting your own realm of experience on Jack and Ennis, and not considering the time period. There were few places, very few places where it was safe to check someone out, and then very caredully. Outside in a public area was not one of them. Do agree that they were sizing each other out as coworkers, but that was all.
I posted "Why the Rush" some time ago, it gives you a little look at the contrasts of the time periods.
Not to be argumentative, if you are near the age of 30, your life experience is much different than Jack/Ennis...you had probably experienced by age 10, what they had not yet by age 20... your "sophistication"(for lack of a better word) outshadows theirs