Parents are concerned that children who have trouble in school will 'fall through the cracks' in the school system. [=will not be given the help they need; will graduate without anyone noticing that they are unable to do the work]
The program is meant to help workers who may have 'slipped through the cracks' [=who may have not been included in other programs] because of their age.
You ought to 'get cracking' [='get going; get moving'] on that assignment. [=you should start working on that assignment right away]
(..) All right. Detective Santiago! Don't walk away from me! Sync & corrections by (Jake) Yes, I did crack the case. So, Santiago, would you do the honors? (All) Ohhh! I hate this! (..)2013 TvShow: Brooklyn Nine-Nine Title: Pilot Season: 1 Episode 1