As director Bonnie Hunt says on the DVD commentary, she told Minnie (Grace) to hit David (Bob) really hard in the scene when she slaps him, to get a better reaction. This is why his face looks surprisingly cheerful behind his hand as he holds it to his cheek - he's trying very hard not to laugh, as he wasn't expecting it. See more...
Continuity: In one of the opening scenes when Bob comes in from walking the dog in the rain, he dries the dog off with a towel and puts the towel on top of the coat tree. He tries to feed the dog and when it cuts back to the dog the towel is on the floor, then his wife comes in and the towel is back on the coat tree.
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