I've watched this movie twice in a row and I kid you not this movie teaches everyone a lesson or two about your life and the people that surrounds it.
1) Never let anybody put down your choice of career path.
2) Ditch the people who do not understand that you need to stay late to do your job.
3) If you missed their birthday, schedule a celebration way in advance, or better yet do an impromptu celebration when your both free. That way, no one gets hurt or mad when you missed their special event.
3) Leave the boss if they don't recognize your work effort at all.
4) Don't whine if you feel like things are not going your way.
5) Be happy for the people who clearly succeeded before you did.