Whenever technology is being used inside the Matrix that is brought "from the future" it is considered an anachronism. The Debugging Gun and the setup for waking Neo up are definite examples. If the Bug is not symbolic (and we don't believe it is) it is also an anachronism. We believe there are serious limitations on what can and cannot be built or brought into the Matrix. This is why Neo and Trinity do not storm the government building with a Zionist hovercraft loaded in from the Construct. It is also why the Zionist equipment prior to Neo's unplugging all looks piecemeal.