Speaking of TWOK, the edit example I have isn't "bad" because most people don't notice it, but it's a huge continuity glitch. Terrell and Chekov pop from one compartment of the cargo bays to another in the span on a cut because they trimmed out all the footage featuring the Rugrat of Khan and hence the business of them going from one one to the other went with it. When Terrell is kneeling to the lower left as Chekov says "We've got to get out of here, now!", he's not looking at the eel tank (which is in the previous room), he's looking at the kid. If you watch his mouth he doesn't say, "What about the tricorder?" he says, "What about the child?"