Plot hole: At the end of the film, we see Edward carving ice sculptures in his mansion. How did he get the ice up there? First of all, it takes place in a warm climate and I didn't see a freezer up there in the castle. He couldn't have gotten ice from town because firstly he had scissors for hands and couldn't have gripped the ice. And, even if by some miracle he could, he wouldn't be able to buy any from town because everyone in town but Kim was convinced that Edward was dead, she told everyone that they killed each other. And Kim didn't bring it to him because she told her granddaughter in the end that she never saw him again after that night. So where did he get that ice?
Continuity mistake: Before Edward is looking at the family pictures you can see some scars on his face are open, when the camera focuses back on him the scars are closed.
Continuity mistake: When Officer Allen is talking to the psychologist, he begins to raise his hands towards his head right before he says "But will he be all right?" but in the next shot his hands are down by his side.
Visible crew/equipment: In the scene where Winona is running into the mansion and up the steps, right before the shot changes, you can see what looks like part of the crew on the left banister by the bottom of the window. (01:28:20)
Continuity mistake: In the scene where Edward is giving dogs haircuts, we see he has a table, the table switches between one and two tables between shots. When we see a diagonal view of Edward's face, the table is in two, otherwise, it's one table.
Continuity mistake: When Edward pushes Jim out the window, he stabs him in the stomach first. When Jim is backing toward the window, we can see a rip in his shirt where he was stabbed, but when his body is on the ground, there is no rip and the blood is much higher than where he was stabbed.
Continuity mistake: Edward stabs Jim and crashes him through the large attic window. Eight smaller window sections remain at the top of the opening, two rows of four small windows. All the outside shots (looking up at Edward and Kim) show the two lower left windows broken out, from the inside all eight windows are intact.
Continuity mistake: All thoughout the movie, the scars on Edward's face keep moving and changing sizes and depth.
Revealing mistake: In the scene where Kim comes home early from the camping trip, Edward is startled and begins stabbing the water bed, thus causing it to spring many leaks. If you actually look at the bed, it isn't jiggling like a water bed should and the water is just spraying out even in places he isn't stabbing.
Continuity mistake: Many of the bush sculptures that Edward creates in the neighborhood are significantly taller than the original shrubberies.
Continuity mistake: During the make up scene, Peg puts her glasses on top of her head. They remain this way until she reaches for the lotion with the lavender in it, upon which her glasses are suddenly back in their normal spot on her face. It counts as a mistake because, while the shot does cut away for a moment, both her hands remain in full view at all times, so there's never a chance for her to reach up and lower her glasses. (00:00:01 - 00:00:27)