I get that Siegel and Shirley didn't exactly see eye to eye but her photogenic face and ability to disappear into a character helped the film despite their differences. She carries this complicated mix of pious Catholic duty and the woman of ill repute who occasionally emerges. Seeing Eastwood's Hogan letting his guard down and admitting to his attraction to her while she holds off her own feelings is fun. Their dynamic is amusing. Despite the film's rep critically (many of those involved even panned it), I love the movie. I like Eastwood in this because of his dry wit, poking fun at his past iconic roles at that point, playful exchange with MacLaine particularly in regards to her nun duty, and the adventurous spirit the film has which allows him to be a part of all the action as only he could.