Rico being sick was a very pivotal moment for the theme because it cost a lot of money so his mom is always upset with him, so there are more problems he can't run away from.
Rico having to help his dad home after he's drunk is important because Rico knows his dad has a drinking problem and he doesn't want to be around that anymore, that's another reason why he tried to run away.
Gilberto winning the lottery was a crucial event for the theme because it gave Gilberto, Rico, and Jimmy a chance to try to run away from problems in New York.
Gilberto leaving just gave Rico a reason to run away from problems.
Rico and Jimmy leaving showed their denying of the theme that you can't run away from problems.
Wisoncin 350 miles
Rico and Jimmy arriving at Gilberto's house was just a reformation that they were trying to run away from mistakes in New York.