Crew or equipment visible: Camera dolly tracks visible reflected in the shop windows.
Audio/visual unsynchronized: The line "On top of everything else, there was a full moon last night" by Scott clearly dubbed in as he turns around.
Errors in geography: There are no palm trees in Nebraska.
Revealing mistakes: Basketball double is significantly taller than Michael J. Fox.
Revealing mistakes: Coming out of the shower, Scott's underwear is visible under his towel.
Continuity: After Scott first "wolfs out", he talks to Stiles and closes his locker door. In the next shot the locker door is open again.
Continuity: On the way to the party when Stiles is surfing on top of the van, they pass the same "Jack in the Box" twice.
Continuity: At the dance, Stiles' position changes as Teen Wolf walks down the line of people. First he is seen standing next to Mick, then he is further down the line.
Continuity: The van that Scott drives home (and parks up on the kerb) seems to be missing the next morning when the outside of his house is shown.
Audio/visual unsynchronized: During the big game, the coach says to a player, "That's a purple heart, kid." By watching his mouth, it's clear that he is simply chewing bubble gum, and not talking.
Continuity: When Scott comes out of the locker room for the big game and talks to his coach, his face is dry. However, when he gets in the huddle, his face is obviously sweaty as if he's been playing, when in fact he's hasn't entered the game yet.
Continuity: As Scott talks to his father through his bathroom door, Scott's jacket (resting on the closed toilet) changes position several times between shots.
Audio/visual unsynchronized: When Stiles says to Scott, "It's looking good out there, babe" and Scott replies "Yeah, how would you know Stiles?" You can clearly see Stiles's voice is dubbed.
Crew or equipment visible: While Stiles is van surfing, a police motorcycle escort with its hazard lights on is briefly visible in the bottom left of the frame.
Errors made by characters (possibly deliberate errors by the filmmakers): While in the hardware store, Scott hears the kid blowing the dog whistle; However, Harold is completely unaffected despite also being a werewolf.
Revealing mistakes: As Scott and his dad celebrate in the bleachers at the very end of the movie, a red-shirted fan above them to the left notices her pants are unbuttoned and fly is undone. The fan awkwardly attempts to fix things for several seconds.
Continuity: After Scott makes his big entrance for the championship game, he is seen throwing his gym bag on the floor twice.