Other mistake: When Fletcher is attempting to force himself to write the word "red" on his desk, in the shot before the "blue" is revealed, his pen is not even touching the desk and his final pen movement is a curve which doesn't correspond to an exclamation point.
Suggested correction: He had already finished writing "blue!" by the time we see the shot of him holding the pen off the desk. He was probably making the motion of writing "red" (with the curve you see corresponding to the "d") not realizing that the pen wasn't touching the desk, and not realizing that he had already finished writing "blue." Hence his initial gleeful reaction-he thinks he's successfully beat the spell, until he sees the writing and realises he hasn't.
Continuity mistake: When Fletcher takes his son to the office, they step out the lift and a woman in a purple suit is seen walking to the left. In the next shot, the same woman is walking to the right. (00:06:25)
Suggested correction: That's a different woman with a different hairstyle. The second lady's hair is up over her ears and the first woman's suit is a darker purple.
I don't think there's enough detail in the wide shot to say it's a different woman or not. She's seems to be carrying the same clipboard in the same way. Plus, in the next shot, the first woman should still be seen somewhere in the wide shot off to the left, and she's not.
Again. In the wide the woman's hair is up. You can even see a pin in it. It's not in the first shot. Also, she would not necessarily need to be seen in the wide shot. The first shot has them in the elevator, then there's a hallway, before they cross the doorway into the lobby. She would have already walked past the desk (notice the lamp) by the time they were a few inches out of the elevator. By the time they walked to the doorway she could easily be out of frame.
Impossible. The very short distance she walks takes her almost 2 seconds, and then she's off camera for maybe a second. The distance to the hall to be out of the shot is almost twice the distance she was just seen walking.
Depth perception. She's walking directly in front of the desk. She's not in the same spot as the second lady (in front of the lobby door). She walks across the screen before Max's feet leaves the elevator. The distance between the left side of the desk and off screen is fairly short and plenty of time for her to cross before they exit the elevator. Third time...different hairstyle. I'm pretty sure the second lady is even wearing a different shirt underneath her jacket too.
Revealing mistake: In the scene where Fletcher drives out of the parking garage almost causing a car accident, you can tell it's his stunt double, because his stunt double is wearing sunglasses and doesn't look too much like Jim Carrey. Then it shows a back view of Fletcher speeding away and his sunglasses are gone.
Suggested correction: There are no sunglasses on the stunt double.
Continuity mistake: Fletcher checks his watch before he tells Max "It's 8:45". But in the last shot of the scene, as he hugs Max, his watch comes into view and shows 5:45.
Suggested correction: Watch shows 8:45 all the way.
