When Sarah is traveling to the Cayman Islands, the camera pans out to her being on a 737, which also appears grounded (engine coverings and wheel chocks). Two scenes later, a clip of a totally different aircraft taking off, a Saab 340, is played.
In the hotel, when the goons call Bobo to get the room number, he said 528. Later when Bobo and Sarah leave the room, the number on the door is 526.
As the boat approaches the dock, it's two men in the boat. When it docks it's the husband and wife.
The "McGuffin" which everyone calls a "hard drive" is really a USB thumb drive (also called a flash drive). No one who's ever seen one would call it a "hard drive". This is a joke though on the expense of the first two henchmen send to collect "the drive". The first one keeps referring to it as a "disc" and the other one corrects him that it is a "hard drive". Both are wrong. They are idiots. That's the joke. The second henchman keeps repeating the joke by calling it a "hard drive" throughout the movie. Everyone else simply refers to it as "the drive".
When Donnie's henchman drops the grenade it shows the large hole in the bottom indicating it is a prop/inert grenade.
At approx., 1hr 31minutes 'dead' guy on the left of screen opens/closes his eyes.
When Matt and Sarah are having breakfast, all of the 'ice' in Matt's two drinks sit at the bottom of the glass as prop ice would do.