When Hank and Dean help Brock train Dean is shown wearing a T-shirt with a tear on his left side, in the next close up shot it's on his right side.
When the camera rotates after Dr. Venture is suspended from the ceiling after his metamorphosis, the corners are black since the animation department didn't fill enough space to accommodate the camera trick.
Dr. Venture is reflected in his bedroom mirror. He's somewhat translucent as you can see the window sill through his leg.