Goofs

After Mason fights with his girlfriend, he throws his paintings out his window, which Marisa notices when she sees the paintings falling from his apartment about two floors above. When Mason and Marisa discover their items(Mason's door; Marisa's statue)fixed, Marisa comes out of her room, which is on the same floor as Mason's, which makes it impossible for Marisa to be about two floors down from Mason. One explanation is simple; Mason has a two story apartment. The next morning when Mason wakes up and sees the garbage truck leaving and his paintings gone, he runs down a flight of stairs and then out of his door. However, when Marisa comes out of her apartment, her door is on the opposite side of the building. So how Marisa saw them fall is still up in the air.

When the two machines first appear in the Riley apartment, the toaster is plugged into different sockets. In the first shot, it's in the bottom socket. In the second, the top socket.

When Carlos is in the cellar, he swings an ax at a glass panel in the door, making one large white crack. In the next shot there are two white cracks in the glass. The cracks change between shots as well.

When Frank is showing the machine how to cook hamburgers on the grill, the full view shows three raw patties on the back of the griddle. But on the close-up, the machine starts to turn the patties and all patties have been cooked on one side.

When Carlos escapes from the cellar after throwing Harry down the stairs, he tries the door to the main entrance which is locked. In the same scene, Harry beats Carlos up and throws him out of the door, however, Harry opens the door without ever using a key to unlock it.

When Carlos is talking to Mr. Lacey behind the model of Lacey's construction plans you can see that the old apartment building is part of the model, as if part of Lacey's plans. But it seems clear enough that he wants to illustrate how the remaining building affects the highrise by including it and a detachable missing piece.

When the citizens of New York return to the building after the fire restoration to see what has happened, an actor playing a police officer backs other actors into the camera, bumping it just before it is cut to another shot.

When the fire starts, we see it spread down into the room with all the balloons. However you can clearly see that the fire is burning on ropes, which are being dangled down to make it seem as though the fire's spreading.

When the newborn alien ones down the sink plug hole Harry runs out of his room and traces t passing through the pipes overhead until it emerges in the toilet. A sink drains by gravity so the water could not flow up into a pipe on the ceiling.

When Harry first uses the dog whistle outside to call the aliens, the high pitched sound is heard before he starts blowing the whistle.

When the characters meet the aliens for the first time on the roof, in the shot immediately following Faye smashing the Frank's pocketwatch, a sunspot from a camera lens is visible moving around on the side of the shed.

When Carlos throws Frank Riley out his café and starts smashing it up, Frank gets up from the floor, then runs to the café window to look inside. You can see a boom mic reflected in the window.

During a far shot of the building burning, a group of people are backing up towards the camera. One of these men hit the camera and you can see the camera slightly shake, the man then looks at the camera with the corner of his eye.

Towards the beginning of the movie when Carlos enters the cafe, he passes the money out to the elderly people. He says "Now you move out, you go to Miami, you sit in the sun, you listen to Bing Cosby...' he was supposed to say Bing Crosby.