When Harry shows Bobby DiLea the box of money, all the cash is rubber banded into neat piles. Later Harry shows Moe the same box and the cash is loose and there doesn't appear to be as much in the box as earlier. Then, when Harry and Moe go down to the casino, the money is in neat piles and the box is filled up again.
When Moe and Harry arrive at Resorts International in the damaged Cadillac, the longshot shows them hitting the corner of a parked car and the Resorts doorman running to inspect the damage. In the next shot, he is still at the door.
When Harry and Moe arrive at Uncle Mike's house it is bright daytime outside. Only minutes pass from the time they enter the house, when Frank goes upstairs to Uncle Mike's room and when Moe goes in the room and screams. The very next scene after Moe screams has everyone outside the house and all the house lights are on as it is nighttime and quite dark outside. Also the winds from the shore are much stronger indicating a major time lapse difference.
When Moe accidentally hangs himself from the light fitting, the metal loop on the back of his concealed safety harness is clearly visible for a split second when the camera looks down at him from above.
The title characters bet on a thoroughbred horse race at The Meadowlands Racetrack but they are reading from a program that is strictly designed for harness racing since The Meadowlands is primarily a harness racing track.
When Harry is at the bar and takes the towel to remove the tropical tan lotion, a quick shot before he wipes his face shows the makeup is already gone. Also, there is no makeup on the white towel he used.