When Edward's bush sculptures are finished, most of them are much higher than the original hedges.
The first dog that Edward grooms changes breeds before and after its hair was cut.
When Edward first enters the Boggs' home, he accidentally pokes a hole in Kim's waterbed and covers it up with a stuffed animal. Later that night, Peg tucks him into the same waterbed that is not leaking. It doesn't leak water again until Kim comes home from her trip and scares Edward.
When Bill is watching TV in the garden, Edward is standing right next to him, in the next shot Edward is further away and starts walking towards Bill again.
There is no egg on the whisks of the cookie-making machine after mixing.
On one version the movie poster of Edward's profile, there is a grammatical error. It says, "The Story of a Uncommonly Gentle Man", when it should clearly say "...an uncommonly..."
Many of the businesses seen in the film have Visa and Mastercard logos in their store front windows. Yet at least one business still has an older sign which says "Master Charge" instead of "Mastercard." Tim Burton deliberately obfuscated the time period when the story takes place.
When Edward unlocks the door after everyone leaves to find him, we can see some white cue tape where he is meant to stand (Open matte only).
When Kim startles Edward after seeing him in the mirror, you can see the board that replaced the water bed as he jumps up from between the water fountains.
Visible line attached to the "sculpted" Bear when Denny knocks it over with the van.
When Peg leaves Edward to answer the phone after she gives him the clothes, she (obviously) leaves the room. Just as she is about to walk back into the room, white cue tape placed right where Peg stands is visible.
When Edward begins to cut Joyce's hair, she tips her head back and you can see the band of the wig beneath her bangs.
Upon Esmeralda's remarks of Edward "coming from hell", you can see the reflection of a cameraman on the left side of the window.
When Peg comes in Kim's room to help Edward put on the white shirt that Peg gave him to change into, the doorway that Peg stands in the yellow mark is still there.
One shot of Edward surrendering to the police for his robbery shows the cameraman's shadow off to his left.
When Peg stands by the mansion's garden gate where she meets Edward for the first time, acres and fields are visible just behind the gate, even though this is supposed to be atop a small mountain.
When Edward sculpted his first bush shaped like a dinosaur, it is significantly taller than him, but he did so without using a ladder.
When Peg wants to bandage her daughter's injured left hand, Kim raises her right hand initially, but quickly offers her left hand instead.
When Kevin places the hose pipe on the ground, he doesn't actually turn off the water tap.
Edward mentions that Joyce showed him the back room where "she took all of her clothes off", but she didn't actually take anything off! She just unbuttoned her blouse a little bit.