With so much going for it, it’s disappointing when Shubh Mangal Saavdhan doesn’t come close to sticking the landing. The film’s final 20 minutes includes an elaborate, less-than-sensible gag, a spot of screenwriting panic, an on-the-nose sermon, and a deus ex machina when none was required. But this doesn’t erase what’s come before: a funny, hopeful film, with enough dry wit and generosity of spirit to allow it to circumvent the farcical pitfalls of its subject matter.