At a count of 15, Marvel's The Avengers is 2012's most mistake filled movie so far (The Hunger Games is second at 13). Here are some of the mistakes that have been identified thus far---
Factual error: The video game company NAMCO Bandai is misspelled twice as "NAMECO Bandai" in the end credits.
Audio problem: When one of the computer operators resumed playing Galaga, the sound effect heard is for an enemy ship attempting to capture the player's ship, but what's shown on screen is normal gameplay.
Continuity: In multiple shots where Iron Man is flying around the city, there are cuts on his forehead. However, when he is lying on the ground and Thor rips the face mask of his suit off, the cuts on his forehead have disappeared.
Continuity: After Iron Man takes out a worm "Jonah style", he crashes into a cab and stop about two feet away. He gets up, there is a quick shot of him on the inside of his suit, and when he gets up, the cab is nowhere to be seen.
Continuity: Near the end of the big battle scene, Captain America is winged by a blaster bolt. When he is helped to his feet by Thor, he is holding his side, and there is visible damage to his uniform. In later shots, all evidence of being shot is gone from his uniform.
Continuity: Just after Dr. Banner asks Nick Fury how many spectrometers the Helicarrier has access to, he takes off his jacket, rolls it up, and puts it under his arm. In the next shot, the jacket is suddenly draped over his arm.
Continuity: When the vehicle bringing Captain America & Agent Coulson to the Helicarrier lands, in the wide shot, as the vehicle touches down, the wing tips fold downwards and inwards as if preparing for storage on board. But in the next shots outside the vehicle as Captain America disembarks, the wing tips are in their extended and locked flight position.
Factual error: In the scene in Stuttgart, we see a "reserved parking" sign written as "Reservierten Parken". In correct German it would be written "Reservierter Parkplatz".
Continuity: Throughout the film, Tony Stark's chest ring can be seen glowing through his shirt except for two occasions when it's suddenly off - after Loki escapes from the helicarrier, and when Loki and Tony Stark are talking in Stark tower.
Continuity: When Captain America is punching the heavy bags and Fury first walks in, the bag that Captain America is punching (not the one he already broke) changes from not having duct tape around the middle, to having it, and then back.
Audio problem: When Bruce Banner meets Natasha Romanoff for the first time in Calcutta, there's a shot from behind her where Natasha is heard talking but her reflection in the small mirror behind Bruce isn't.
There are a few more over at the site so feel free to click the source link if you are so inclined to discover all the minor hiccups in The Avengers.
The Avengers is an upcoming American superhero film produced by Marvel Studios and distributed by Walt Disney Pictures, based on the Marvel Comics superhero team of the same name. It is the sixth installment in the Marvel Cinematic Universe. The film is written and directed by Joss Whedon and features an ensemble cast, which includes Robert Downey, Jr., Chris Evans, Mark Ruffalo, Chris Hemsworth, Scarlett Johansson, Jeremy Renner and Samuel L. Jackson. In The Avengers, Nick Fury, director of the peacekeeping organization S.H.I.E.L.D., recruits Iron Man, Hulk, Thor, and Captain America to save the world from destruction.
Development of The Avengers began when Marvel Studios received a grant from Merrill Lynch in April 2005. After the success of the film Iron Man in May 2008, Marvel announced that The Avengers would be released in July 2011. With the signing of Scarlett Johansson in March 2009, the film was pushed back for a 2012 release. Whedon was brought on board in April 2010 and rewrote the screenplay that was originally written by Zak Penn. Production began in April 2011 in Albuquerque, New Mexico, before moving to Cleveland, Ohio in August 2011 and New York City in September 2011. The film was converted to 3D in post-production.
The Avengers was released in the United States on May 4, 2012 in 2D and 3D.
Running Time: 2 hrs 23minutes
Release Date: May 4 2012 (USA)
MPAA Rating: PG 13 for for intense sequences of action and violence, some disturbing images, and language
Starring: Robert Downey Jr., Chris Evans, Chris Hemsworth, Samuel L. Jackson, Tom Hiddleston, Cobie Smulders, Jeremy Renner, Clark Gregg, Stellan Skarsgård, Mark Ruffalo, Amanda Righetti, Scarlett Johansson and Lou Ferrigno The Incredible Hulk (voice) .
Directed by: Joss Whedon
Written by: Zak Penn (initial screenplay), Joss Whedon (revised screenplay)