Parents need to know that younger kids will go for all of the crazy, bouncy action (there's a good dog in it, too), while aspiring athletes will love the Flubber-enhanced basketball game. This is family entertainment at its best -- the movie is sweet, clever, and laugh-out-loud funny.
Mostly family fun, watch the language and gun violence.
Inappropriate language: Shut up, idiot, stupid. Very blatant and easy for the kids to infer usage.
Violence: there is a scene where the professor is shot at (with a gun!) and it hits the side view mirror. Also, a commander in the army threatens to shoot the car out of the sky with missiles.
Our six year old loved it, and her parents enjoyed it too. The "flubber" jumping effects worked because they weren't realistic in the way modern effects try to be. The movie does portray a strange mythical all white America. Not a person of color to be seen in the entire film which could off putting, especially to children of color. Subtle jokes about Congress and the military Joint Chiefs at the end still hold up today.