Deliberate mistake: In the towel-dance scene after Demi has put on her white panties and spins off the towel from her hair she starts to rip off her body towel. Then in the next frame the towel is again tucked in. Apparently they didn't want Demi topless when she leaned over to slip on her blue shorts.
Deliberate mistake: Just before Donald has a fight with Jack at the end of the film, we see Donald jogging down a flight of stairs to escape the building. Then after a bit of a punch up with Jack, we see Donald running back up the same staircase to escape Jack, but when he reaches the top it turns into a dead end. There is nowhere that Donald could have came from when we see him coming down the stairs. (01:19:35 - 01:20:35)
Deliberate mistake: The actual Lazlo Almasy died in the 1950's after voluntarily serving with the German Army and SS during WWII.
Deliberate mistake: In the scene where the boys scratch off the paint on the window so they can look at the ice skaters getting dressed, there's a grille about 6 inches from the window. When viewed from outside their faces are pressed against the grille, but when the shot changes to inside the building looking at their eyes moving, their eyes are much closer to the window than the grille would allow. (00:09:30)
Deliberate mistake: When the media truck follows Mel, he comes to a traffic light and stops. When he throws away the van's keys, he speeds off from the intersection. Why are the cars at his left not driving? They look like they have parked there and with no drivers present in the car. Weird for a very busy road.