The characterisation within this episode is what brings life to the show. Adam Baldwin and Zach Levi are superb, with Baldwin's 'I don't care attitude' that ends up being that he really does care. His gruff exterior gives way to a slightly softer man, like in "Chuck versus the Undercover Lover". Levi's performance of a man about to be confined for the rest of his life is almost tear-jerking, but his fumbled charm and plain clumsiness save his future. Josh Gomez was as usual perfect with the comedic relief in a tense episode; his character is underrated and over-looked. The producers need to look into expanding his character, it's not just a bunker for the comedic relief.
The actual story of Devon entrusting the engagement ring to Chuck is a symbol that his family comes first. Chuck never really stopped to think about going into the bunker until he was on his way, and even then his thought's were still on the lost engagement ring. It's story lines like that which keeps the audience coming back, Chuck isn't just a shoot-em up show, it's roots are firmly planted with his family. It's nice to see story lines that include that. Superb!