Danny says to Katherine he got Maggie to eat three pieces of deep dish pizza. The pizza they ate was hand-tossed. Deep dish pizza at Pizza Hut is served in a pan. Their pizza was on a wood serving tray and obviously thinner than pan pizza.
When Danny, Maggie, and Michael are getting pizza (when he's convincing them to be his "fake" children), you can see a man behind Danny in a yellow plaid shirt. In one shot, he gets out of the booth, then he is gone. But in the next shot, the man is back, then gets up and leaves the table again.
When Danny, Maggie, and Michael are getting pizza (when he's convincing them to be his "fake" children) the camera shifts from Michael to Danny and shows the pizza to the left. When the camera shifts back from Danny to Michael, the slice of pizza is moved.
In the final scene of the film Danny points to Brian; as he plays the bass guitar, his beard (as Danny mentioned early on in the movie) supposedly wiggles - the string used to make this happen is clearly visible.
When Devlin claims that her husband made all his money suing the Dodgers after being hit by a foul ball. That is not legal. There is the law "Assumption of Risk" which goes into effect at baseball games. If you get hit by a ball, you are not allowed to sue because of that law. He would not have been able to sue, let alone get money from the Dodgers.
When Palmer and Dolph are having dinner alone, and the girl comes running in yelling her sheep needs help, she refers to her sheep as "he" several times. She asks for a vet and again says "he is dying". When Dolph goes to help, he milks the sheep and tells it to go and have babies.