My father (may he rest) was very fond of this film. For him, its significance rested on a single line—a sentiment he often repeated, believing it to be the truest thing about life he’d ever encountered in a movie: "People are always talking ya about truth. Everybody always knows what the truth is, like it was toilet paper or somethin', and they got a supply in the closet. But what you learn, as you get older, is there ain't no truth. All there is is bullsh**, pardon my vulgarity here. Layers of it. One layer of bullsh** on top of another. And what you do in life like when you get older is, you pick the layer of bullsh** that you prefer and that's your bullsh**, so to speak." He would often reword this quote, and I understand why—it’s amusing and insightful, a combination that really resonates. It also offers a good understanding of what the film is about. The story centers on redemption; characters who seem unlikely to accomplish anything positive are shown to be capable of genuinely heroic acts. Conversely, those you assume will be straightforward can be deceitful. The humor revolves around how we view things, our assumptions, and the reality that unfolds, all while delivering a deeply sincere message concealed within the layers of falsehood it constructs. Above all else, though, it’s enjoyable throughout.

Source on TMDB