- Continuity: When Oskar goes to visit his father, his cheek appears untainted, despite the scar and bandage from before. Later, the bandage is back on and even later, the scar appears.
- Continuity: In the scene where Oskar finds and inspects the solved Rubik's cube, the camera cuts to a sleeping Eli who is clearly dressed in clothes she won't get until much later in the movie, when she picks it from Oskar's mother's closet.
- Continuity: Throughout the movie there is snow everywhere, but it vanishes later in the movie to re-appear again. In the scene following Oskar and Eli in the basement, Eli runs across a bridge and eventually climbs up a tree. As she crosses the bridge, snow can be seen in the background, but as she climbs up in the tree there is no snow anywhere nor any traces of it. In the scene that takes place the next morning, the snow is back and heavily covering everything.
- Continuity: As Oskar shows the Rubik's Cube to Eli, one side is almost completely white, except for one single square. This square changes color between red and blue between shots.
- Revealing mistakes: The jar of acid used by Håkan has a metal lid that would be destroyed if the jar was tilted. (In the book, it is clearly stated that the jar has a glass lid.)
- Revealing mistakes: The scene with the empty jungle gym near the end of the movie, two people can be seen moving in the background. These two are actually Eli and Oskar, since it's obvious that this scene is cut and re-used from one earlier in the movie (where Oskar and Eli learn Morse Code).
- Incorrectly regarded as goofs: When Eli invites Oskar in her apartment, her image is reflected into the mirror on the wall. What a vampire should and should not do or be able to varies from story to story. It's established in the source novel that Eli does have a reflection, as it is how Oskar sees her for the very first time: through a reflection.
- Crew or equipment visible: The entire crew is visible in the reflection of the glass at the opposite end of the swimming pool hall when the three bullies enter the scene.
- Incorrectly regarded as goofs: Hakan's first victim starts to get back up after he is gassed. However, the gas used is Halothane, which is used as a general anesthetic meaning the loss of consciousness is only temporary as is explained in the book.
- Continuity: In the last scene, when the bullies are holding Oskar underwater, the hand holding Oskar underwater is backwards, since the way the bully is holding him his fingers should be pointing to Oskar's back and not his front.
- Anachronisms: As Oskar is looking in his clip book with old newspaper articles, a serial number used by the Swedish police is visible. That number ends with 95, which means that crime was committed in 1995. The movie, however, is set in 1982.
>>> WARNING: Here Be Spoilers <<<
Goofs below here contain information that may give away important plot points. You may not want to read any further if you've not already seen this title.
- Continuity: SPOILER: Near the end of the movie, Eli embraces Oskar after feeding. They kiss and it's clear that blood comes off onto Oskar's lips. In the next shot, the blood is gone.
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