The Walt Disney Co. on Friday recalled 3.4 million copies of its home video “The Rescuers,” saying two frames of the 110,000-frame animated film about heroic mice contained an “objectionable background image.” It was the first time that Disney has ever recalled a video tape for having an objectionable image, although in the past various groups have claimed that “The Lion King” and “The Little Mermaid” contained inappropriate images or language. (Those claims could never be proved.) A Disney spokeswoman said the images in “The Rescuers” were placed in the film during production but she declined to say what they were or who placed them. Customers who bought the video since its release Jan. 5 may return it for exchange to Disney video distribution wing Buena Vista Home Entertainment in Carson CA.