coughspykidsandcheaperbythedozencough
The cliche where some psuedo-scientists gives jargon-filled speach that really means nothing--it's in a lot of non-serious sci-fi.
Like, "If we activate the quantum flux generator, it will send quantum-protons and quantum anti-electrons into orbit, causing the whole world to spin backwards, reversing the flow of time."
Something like that was actually in an old episode of power rangers....
One more: Villlains having names that resemble evil things: Like "Rita Repulsa"(ha ha--she's repulsive..funny) "Dick Dastardly" and the mustached guy from Dudley DoWright, I forget his name.