Continuity mistake: When Sonny is giving Julian a bath, in the shots where Julian is closest to the camera, you can see a wide gap between the bath and the camera and even the side of the bath tub, as if it's in the middle of the room. In the shots behind Sonny, the bath is right next to a brick wall.

Big Daddy (1999)
21 continuity mistakes - chronological order
Directed by: Dennis Dugan
Starring: Adam Sandler, Rob Schneider, Joey Lauren Adams, Cole Sprouse, Jon Stewart
Continuity mistake: When Sonny knocks out the delivery guy and he tries to wake him up, he pats him on his pants. When the camera zooms in, his pants are black and white (checkered). The next shot, he's wearing khaki pants.
Sonny: Hey! You just made the biggest mistake of your life, baby. I know you're gunna be missing me when you have that big, white, wrinkly body on you with his loose skin and old balls... gross! Ugh.
Trivia: There is some kind of obsession with feet in this film. Corrine is a foot doctor. Sonny tells Julian that he smells like a foot and Julian's teacher's name is Mrs. Foote.
Question: When Mr. Brooks states that Sonny lied about being Kevin Gerrity to get custody of Julian, he says it's a big problem in this state. Why do so many people do that in New York (as opposed to other places)?
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Answer: Maybe I'm misinterpreting the line, but I thought "big problem" in this context meant that the state would aggressively pursue criminal charges against Sonny for his actions, as in it's his big problem to deal with now.
Phaneron ★
But in that context, wouldn't it be a "big" / serious problem in any state? I can't imagine that most states would be easy-going about it. He seems to mean that it happens a lot in New York, but I might be wrong.
Other states would certainly be aggressive in that situation, but given that Mr. Brooks is an employee of the state of New York, he could just be emphasizing how much trouble Sonny is in.
Phaneron ★
Fair enough. Sonny might have thought that it was OK for him to pretend to be Kevin, since he is good friends with the real Kevin.
Mr. Brooks was being facetious by specifically saying "big problem in THIS STATE." Obviously Sonny knows what he did was very wrong and illegal. It would be like if you were driving in a different state and didn't stop at a stop sign. The cop might say "I know in your home state the stop signs are optional but here in Texas you're required to stop at the sign."