When Emma is coming out of commercial during her radio show, the producer counts her down for her next segment with the words "five, four, three, two, one". No one in radio or television would ever vocalize the word, "one" in a countdown. This number is always replaced with a vertical finger signal to represent "one" and a direct finger point to show "zero" or "begin". Since the microphone always goes live on "two" the audience would otherwise constantly be hearing a disembodied voice say "one" when they come out of commercial.
During the Indian party Emma gets an Indian Henna tattoo on her hands, which is still there when she goes home. However, the next morning it has disappeared. It is true that Henna is not permanent, but it will last a few days at least.
When Richard and Emma are sitting on the bed near the start of the movie and he has just brought in some takeaway coffee, the coffee cups disappear and reappear during the scene, or change from being side-by-side to one being inside the other.
When Emma leaves her father's house after breakfast, she opens the door and the window of the car is up. When the shot turns from her father to her you can see on her right side that the window is rolled down a couple of inches. While she walks to the car, she moves across the window and a few seconds later on her left side you can see that the window is rolled down more than halfway. When the shot turns back to her, she is next to the car and the window is up again.
When Emma and Patrick are on top of the building, Patrick then leaves and Emma drops the pile of papers. She is standing near the wall and the papers are touching the wall. A pole is visible in the front of the shot. In the next shot the papers are all around this pole and no where near the wall.
The type of sprinkler head that Emma sets off with the burning paper is one that is opened by a link that holds two pieces together that melts with enough heat. When the link melts it opens only that one sprinkler, and would not set off the others in the building.
When Patrick and the Kid hacker decide to "marry" Patrick to Dr. Emma via manipulation of records, we can see on his computer that the title on the screen showing these records is spelled incorrectly. The title reads "VITAL STATISTICS / Marriage Registery", when it should be "Registry".