As you said, no standardization, which means all precincts reports on wildly different time intervals, if you can interfere with just tallying during or after the fact, and you can get the information on other precincts before any other outlets, you could easily take advantage of this.
It's essentially the Superman II version of interfering with an election. Just put your thumb on the scale a little bit everywhere on late precincts all at once.
The fact that so many states let a simple majority of their state take _all_ electors actually makes this possible. If more states removed the Unit Rule and went like Nebraska and Maine this would be far less effective.