Just Go with ItGoofs
Continuity
When Palmer meets with the "wife" at the hotel bar, her hair is curly. But when they say goodbye in front of the hotel a few minutes later, she has almost fully straight hair.
When Katherine drives into the parking spot at the pizza place, she parks correctly in between the lines but when she exits the vehicle, her car is parked diagonally across two spaces.
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.
Factual errors
When Katherine is confessing to Devlin at the end of the movie, she says she drives a Honda, but she gets out of a Chevrolet at JD McFunnigan's.
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.
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.
Miscellaneous
At around 58 mins Danny tells Maggie "And I love you, my little British crumpet!" In England the word crumpet in the context provided would mean hot or sexy woman--inappropriate from father to "daughter," whatever her age, but especially when she's grade-school age.
Crew or equipment visible
When they are in the room with the patient who had an implant break, crew/equipment is visible in the window to the right.
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.
Errors in geography
Smart and Final's house brand, First Street, can be seen in some background shots, but there are no Smart and Final stores in Hawaii.
Plot holes
In the eyes of Palmer, there is no way Danny could marry her. She was under the impression that he was still married to "Devlin" and therefore could not walk down the aisle. That would be bigamy.
Character error
When Katherine is trying on high heels and stumbles she says its because she hasn't worn high heels in awhile but in an earlier scene she is clearly seen wearing high heels.
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.