The Wedding of Iron Man - S1-E13
Deliberate mistake: When Tony Stark is looking through security footage in the flashback, the footage is all clips from previous episodes for which he couldn't possibly have surveillance footage of, including but not limited to shots of him and/or his teammates in a snowy mountain range, inside a volcano, on the ocean floor, and a random section of the Pacific Coast Highway.
Origin of Iron Man: Part 2 - S1-E12
Deliberate mistake: When the Mandarin's goons are attacking the monastery, all five monks inside have the same face. (00:06:23)
The Defection of Hawkeye - S1-E8
Deliberate mistake: When Mandarin is watching and wondering why Julia is tailing Clint, the road surface and cliff walls around Julia's car are recycled repeatedly. (00:10:55)
Answer: Gleaned from the Internet: Some critics criticized the premise of so many one-off battles that were introduced and concluded within one or two episodes. Others felt the first-season plot lines were overly simplistic and never progressed or developed through the season. Also, the rivalry between Iron Man and the Mandarin also failed to capture viewer's attention.
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