Over saturation is the term for inappropriately intense colors in an image or video. This can be caused deliberately for artistic effect, as well.
A well-known example ("illustrated here" [s]h[/s][s]ttp://preservation.bavc.org/artifactatlas/index.php/Oversaturation[/s] (Dead link)) is when the reds on a television set come through too strongly, resulting in unusual skin tones.