The Wedding of Iron Man - S1-E13
Continuity mistake: When Wanda is dismissing the possibility of Mandarin planting a bug in Stark's armory, she is looking through a deck of tarot cards. When the shot changes, her hands are down at her sides. (00:04:55)
Answer: As the other answer indicated, it is a common filming technique used to achieve various visual effects. Handheld cameras can create a deliberate sense of movement that follows a movie's action. A cameraperson can physically move in much closer to an actor, creating a more intimate connection between the character and the audience. It can also reflect a character's movement from their vantage point, and can be used to create a greater sense of realism with an edgier, less-rehearsed, or a documentary-style feel.
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