Zemeckis's successful approach with animation

This is a link to a film directed by Robert Zemeckis called Who Framed Roger Rabbit. I decided to provide this link because it gave me an insight into another extraordinary film directed by Zemeckis. However, with this film, according to the review, the director took a comedy/thriller approach. I found this to be a very interesting combination of genres. In addition, it made me realize that Zemeckis does not necessarily depict only one type of genre in his films, instead it is common for him to take a more combined approach. Nonetheless, he took a combined approach in Forrest Gump.
While the author gives us a review and summarizes the plot of the film, he also suggests that Zemeckis is a very successful director with a creative mind. Throughout the review, he continuously praises the film and director, and refers to it as a "milestone in animation history."

Here are a few quotes

The film was a milestone in animation history... received four AcademyAwards, one of which was a Special Achievement Award for Animation Direction (Richard Williams). Director Robert Zemeckis must be credited for piecing together the production that involved hundreds of animators, and the special visual effects of George Lucas' Industrial Light and Magic...

Earlier efforts to combine humans and ink-and-paint cartoon characters side-by side in a film [Disney's Song of the South and Mary Poppins, for example] are considered primitive next to this film.