Who Framed Roger Rabbit was a fantastic film and was one of the first times I remember feeling oddly drawn to the female character Jessica.
Part of that was my age but part of it was the incredible job the animators did - by hand and eye - of creating the illusions, especially the illusion of physicality and physical interaction between the Toons and the humans.
This video explains how, the level of commitment to detail that makes this film stand up even today.
It generated a phrase coined by Disney while working on the movie: Bumping the Lamp. It means going above and beyond what was expected of the animators, watch the video to understand why.
"Seemingly superfluous details help sell the effect at a subconscious level".
Always take the chance to bump the lamp in your work.