Terminator 2: Judgement Day
Anyone who has watched the film knows that Arnie arrives naked in the first movie. Kyle Reese explains to Sarah that only living organisms can travel through the time machines, but they have to be nude. That includes machines covered in living tissue. But, the T-1000 is obviously totally liquid metal, so how did it go through the time machine?
Star Trek
For someone who really wants revenge, Nero seems pretty content with just laying around for 25 years just waiting for the "right" moment to strike. Did anyone tell him that might not be a good idea?