Intelligence is inversely proportional to body size. Drawings are real as long as you're not aware they're drawings. A 'toon's GI-tract will always expand linearly in proportion to the object being swallowed regardless of the object's size. A vehicle's speed is limited only by the size of the numbers written on the speedometer. Pretending one is stepping on brakes is as good as having them.
Holes are moveable.
Drawings and constructs warp reality so as to encompass them. This warping of reality often does not extend to the artist or builder. A sharp object will always propel a character upward. For instance, the Road Runner can materialize signs to express himself without speaking. Explosive weapons cannot cause fatal injuries.