Continuity mistake: When Robin Williams puts the flubber into his back pocket to show Sara how it will bounce him back up, you can clearly see a hole in which the flubber escapes. When he falls to the ground and Robin Williams turns over the hole is gone.
Continuity mistake: In the scene in which Prof Brainard and Sarah are fighting the bad guys at the mansion, Sarah has Flubber on her hands. She is slapping Wilson around, and you can clearly see that the person who is slapping Wilson is a dummy.
Revealing mistake: In the end, Phillip lands in the chair and he stops bouncing. You think he would still bounce even though the chair was soft.
Continuity mistake: When Robin Williams first flies his car, he throws an apple straight down, but in the next bit, the apple is going diagonally. Is it a magic swerving apple that the Prof. created?
Continuity mistake: In the scene where the Professor and Sara are fighting the bad guys, Will Wheaton's character throws an ashtray at the Professor. Before the ashtray gets to him he sprays his rear end with the liquid flubber from the squirt gun. When he does this he sprays his jacket which at that time is covering his rear. When he jumps and hits the ashtray the ashtray does not hit his jacket but hits his pants. According to the movie flubber in any form needs to come into contact with the object to bounce back.
Audio problem: When Sarah and Professor Brainard are so excited as they are coming home from the Ford guy, the shot is obviously dubbed over (Sarah's mouth doesn't match the words she is saying).
Continuity mistake: After Phillip falls outside of Sara's window, watch the leaves on the ground. They change positions throughout shots.
Factual error: In the scene where the Professor Phillip first sees his creation (Flubber), he states that Flubber is 77 degrees Kelvin. Theoretically speaking, 77 degrees Kelvin is extremely cold, about -195 degrees Celsius (or -320 degrees Fahrenheit). The professor was handling Flubber with his bare hand at one point so he should've acquired one heck of a cold burn.
Audio problem: In the end, the guy throws the glass thing, it flies, it bounces, and it falls to the ground. But we never hear it.
Continuity mistake: When the scientist throws the balls out the window, they go diagonally into the sky but then they come back down and hit the men who are standing in the place where they took off from.
Factual error: When Robin Williams rides the car above the clouds, he is fine. At a level like that it can be hard to breathe as temperatures are often quite low when above the clouds, mainly below freezing point.
Chosen answer: The movie is called Some Came Running.