When Evan writes the note under the doctor's desk, he has just moved the box containing the home movies to the floor in front of him. After writing the note, he reaches forward and turns the projector on but never sets it up.

When Evan falls off the couch after being hypnotized, there are some blood spots on the front of his shirt. Just before the scene is over, the blood spots are gone.

When Evan asks his mother if she brought the journals to him in jail, she holds up two, saying that she "only found these two." When the "sisters" knock the journals out of his hands, three journals fall to the floor.

When Evan's mother takes him to the psychiatrist to be hypnotized (after the mailbox incident), the blood on his face changes many times between shots.

When Evan throws the fancy meal for Kayleigh, the flower in her hair repeatedly disappears and reappears between shots.

Thumper smokes his bong incorrectly. He draws smoke into the chamber, but then removes his face, letting the smoke escape rather than inhaling it.

When Evan drops a match onto the gasoline-soaked journals, it simply starts a small fire as if it were lighter fluid. Gasoline is far more explosive. It would have gone off like a small bomb, singeing their hair, causing second-degree burns, and propelling a number of the journals at least 15 feet into the air. Not only was this inaccurate, but considering that some viewers might have imitated this after watching the movie, it was very dangerous to depict it in this fashion.

When he is visiting his mom in the hospital on her medical chart it states ? Metastatic oat cell carcinoma lung ca. 14 pack year history which doesn't make sense. 14 packs a year is nothing and she would need two packs a day at least.

When Evan comforts his mother outside of the psychic's building, she confesses that she had two stillbirths before Evan was born and she refers to Evan as her miracle baby. When Evan is strangling himself in his mother's womb, she can be heard to say that she had three stillbirths before he was born and she again refers to him as her miracle baby. This is not a flashback, but rather a deliberate change explained by Eric Bress and J. Mackye Grueber. It is implied that the two previous miscarriages before Evan went through the same journey and that Andrea is saying this to her new (future) child - a girl, who has broken the family "curse".

When Evan goes to burn his journals with his buddy in the large metal can, he pours the gasoline into the can and then sets down the gasoline right smack next to the can and proceeds to light the match and watch it go up in flames. Although in Hollywood this clearly is a very dangerous move that could incite an explosion, in real life liquid gasoline doesn't explode. Gasoline must be evaporated to a 1:15 ratio to air in order to explode, which is very hard to achieve outside a controlled lab environment, despite what numerous Hollywood films show.

In the theatrical ending, Evan still has multiple journals though he has never met Kayleigh. Dr. Redfield suggested that Evan start keeping journals after his mysterious drawing in class and not after his incident with Kayleigh and Tommy's father. After the incident, Dr. Redfield suggested that he meet his father, not keep his journals. It's not unreasonable that he committed to keeping journals years after Dr. Redfield asked him to (hence his interest in psychology). Though the books would have been completely different, Evan's burning of them was symbolic and not literal.

The note reading "I'LL COME BACK FOR YOU" changes. Note the break between the top stroke of the I in I'LL and the apostrophe and no break in the bottom of the B of BACK the first time we see the note. When we see the note at Kayleigh's grave, there is no break on the top stroke of the I and there is a break in the bottom of the B. There is also no red margin at the top of the first note. This, of course, assumes the note put onto the grave is not symbolic; Evan had kept the original rather than the deeper symbolism of how the entire story is about going back for Kayleigh.

When Evan is in his dorm and the room is backward, his profile is seen for a second; he turns around showing that the left side of his nose is about twice as big as it should be because of the prosthetic tube used to achieve the effect of a dripping nosebleed.

When Evan is in the wheelchair and talks to Kayleigh, his face is desaturated (see the commentary track on the Director's Cut DVD). The effect is visible when people pass behind Evan. Their skin tone changes when they walk through that desaturated part of the image.

When Evan first wakes up without arms, you can see small shadows not completely erased on the pillow from his "missing" right arm.

When Evan and his mother visit the fortune teller in the Director's Cut, she says that Evan has no lifeline and should therefore not exist. But when Evan and his mother sit outside the fortune teller's, Evan's lifeline is clearly visible in his palm.

At the 1:23 mark, you can clearly see the glue from the fake beard Ashton Kutcher is wearing. It's necessary since his character is required to have a beard, a goatee, or be clean-shaven depending on the timeline.

In the credits at the end, there is a name next to a character for "Evan at 3". Nowhere in either of the two cuts is an actor portraying Evan at three years old.

In the end credits: "Opticals and End Credits by" is spelled incorrectly as "Opitcals".

When Evan asks his mother if she brought the journals to him in jail, she holds up two, saying that she "only found these two." When the "sisters" knock the journals out of his hands, three journals fall to the floor.

In the Director's cut version, there is a scene in which Evan's mother tells him that "before [he was] born, [she] was pregnant twice, and they were both stillbirths." However, in the end, when Evan travels back to his birth, the mother says "before [Evan] was born, [she] was pregnant THREE times, but they were ALL stillbirths."

The date on Tommy's tombstone stated he died in April 1995. However, the movie they saw days before his "death", Se7en, was not released until September 1995.

When Evan, Kayleigh, Tommy, and Lenny go to the cinema to watch Se7en (1995), they walk past a freezer at the concession stand which bears the 1998 Pepsi logo.

When Kayleigh, Tommy, Evan, and Lenny are putting the blockbuster in the mailbox, Evan puts the cigarette on the blockbuster and says it should last Lenny two minutes, but his mouth says 10 minutes.

In the final scene of the theatrical cut (not the director's cut), you can see a grown up 28-year-old Evan as a businessman walking out of a building, talking on his cell phone. When he walks by a building, the reflection of a camera is seen moving on a tinted window.

Evan reads his journal and goes back to where he and Kayleigh are making the Robin Hood movie in her father's basement so he can fix it. While he is making his speech to her father about his decisions, during the entire monologue we can see a crew member standing in the back left mirror. If you watch closely, you can see the crew members move.

Although this film is set in New York, there is a Canadian speed limit sign in one of the first shots in the movie as the camera pans across the street Evan lives on.

Although he is not yet convicted of a crime, Evan is held in a penitentiary (he should be in a jail).

Evan asks his cellmate to look at his hands to prove that he can "time travel." He then travels back to when he was a kid and stabbed his palms. As a form of proof, he now has marks on his hands. But if he got those marks when he was a kid, he would have had marks on his hands already when he went to jail (in that reality). So the marks being there wouldn't have proved anything to anyone but Evan himself.

When Evan is asking for his journals, the doctor says they were made up by Evan to cope with the death of "Katie" Miller. Her name is Kayleigh.

When Evan is writing in his journal for the first time, he writes his friend's name as Kayley. Her name is credited as Kayleigh.

One of the times when Evan goes back to when Tommy was going to kill his dog, Kayleigh is hurt on the face and gets a scar. But he doesn't do anything to change the attack, therefore she shouldn't be hurt differently that time.