In the horse racing scene, in the beginning, the name shows Dover Downs, but when the horse winds up losing, it is Hoover Downs.
An hour into the movie when Monty is taking flash pictures of the boy on the rocking horse, the flashbulbs in the camera lights disappear (one falls out during the shot). After the mother says "we want some wallet size", the flashbulbs reappear again in the next shot.
Belinda's calendar shows Monty has 56 days left, but in the following scene Monty complains "I can't go another 4 months."
When Julio attempts to make love with Alison on his wedding night, she goes from wearing a thin robe when coming out of the bathroom and holding hands with Julio to bare shoulders (robe disappears!) as Julio pushes closer for a kiss - all in one cut (good for Julio, bad for Continuity)!
In the hospital scene, when Julio and his wife are at the door, the wife is on one side then on the other side before the walk into the room.
When Allison and Julio leave the wedding, there are cans tied to the car. Upon arriving at the motel, the cans are no longer there. ( Newlyweds frequently stop along the way and remove the cans tied to the bumper.)
During the wedding reception, although the groom's family is ostensibly Latino, you can hear people shout "Opa!" which is traditional at a Greek wedding.
When Nicky and Monty are on the yacht discussing going to Coney Island Nicky says you just go up the Atlantic turn up the Hudson past the Statue of Liberty and turn left and claims it will be only 20 minutes. However, you can clearly see palm trees in the background. There are no palm trees in the NY/NJ harbor area.
Julio's mother is supposed to be crying loudly at the wedding but her mouth and face don't move; she just dabs her eyes with a tissue.