Revealing mistake: When Sonny is on the payphone, you can see Julian mouthing something to the guy on the payphone behind Adam. The guy is giving him instructions.
Revealing mistake: In the surprise party scene for Sonny at Hooters, Layla is holding a real baby and then you see her holding a baby doll. It is very obvious because there is a huge size difference between the two, and the "real" baby's head was always shown.
Revealing mistake: When Sandler is talking to the kid, they are passing through the Greenwich Village area. In the next shot, they are walking in front of a "clock building" (one side has the numbers 1-12 and 0-59). This building is located on John Street in the financial district, which is over 2 miles away.
Revealing mistake: When Sonny puts the newspaper over the puddle of milk, notice it doesn't get wet at all. Newspaper very obviously gets wet when exposed to liquids.
Chosen answer: I used to have to use the local laundromat and I would use anywhere from four to six machines at once. When you have to leave your home to do laundry you tend to put it off as long as possible. She's also probably separating the different types - light, dark, delicates, etc.
Phixius