Revealing mistake: When the injured gardener Peter is in the backseat of the car, his mustache is loose and falling off. The right side runs diagonally past the corner of his mouth with the top too close to his nose and the bottom raised with hairs sticking out. The left side runs horizontally across his lip. (01:25:20)
Revealing mistake: It was "raining" when Francesca was driving toward the house, but her vehicle "moved out of the rain" before coming to a stop. Furthermore, when the camera returned to Francesca walking toward the house, it was not raining and the driveway did not look wet. (00:48:53)
Character mistake: The Gardener threw a knife that impaled an intruder's gut, essentially rendering the intruder incapacitated. At this point, the intruder was no longer a threat and did not pose imminent danger, therefore the Gardener was NOT justified in shooting the intruder in the forehead and killing him. The Gardener could be charged with some degree of murder, such as voluntary manslaughter (provoked and loss of self-control or inability to control emotions). (01:15:20 - 01:15:55)
Continuity mistake: While eating dinner, Lauren has a glass of wine setting on a black coaster. After a scene change and return to the dinner table, an aerial view shows the coaster without the wine glass on it (and the wine glass is missing from the table). (00:38:32 - 00:40:18)
Other mistake: When Volker (Gary Daniels) shot at the gardener, the flash from the gun appeared to be around the gardener's lower right gut, but the gardener's gunshot wound was on the outer side of his left thigh. (01:16:55)
Other mistake: After Ken shoots the pregnant lady, she rolls her head to the side, apparently to indicate death, but her stomach movement shows she is still breathing. (00:01:46)
