Question: What type of guns did the time traveler use to kill the Confederate soldiers?
Question: When Lyle is at his desk, he has two newspapers in front of him and he is circling the same stock on both of them. One newspaper is for the year he's currently in, 1929. The second one is from 2004. How could stocks from the same newspaper 75 years apart possibly be helpful in getting McComb to the presidency?
Answer: Also, it was strongly implied that Lyle Atwood was in New York City shortly after the massive Wall Street crash that occurred in October of 1929, so all he would need to do is find stocks that still exist and are doing well in 2004 and buy those particular stocks when they're presumably at their lowest value in history; the payoff after 75 years would be astronomical for the stockholder.
Answer: Any stock that massively increased in value between 1929 and 2004 would be a great investment for a time traveller, providing vast quantities of wealth to help fund a presidential campaign, for example.
Question: What song was Atwood listening to on his headset?
Answer: According to IMDb, the title is "Sleazebucket Pull", by Fudge Factory Inc.
Question: How can their house still be standing in 2004 when it was destroyed in 1994? Even if they rebuilt it it wouldn't look s old, it would only be a few years old.
Answer: In one of the flashbacks, it is shown that the wife designed the house and had been thinking about it for a long time. I think the easiest answer to this is: the house was simply rebuilt the same as it was.
Answer: My understanding was the timeline had been reset in such a way that the explosion had never happened.
Except that the explosion did happen. When Max carries Melissa out of the house to prevent her death again, their house is exploding in the background. This is because McComb had placed a bomb in the house to ensure that the explosion would kill Max which of course had ultimately failed.
The explosion happened, but it was before Max returned to his own time in the future. Once he went back through the time portal, everything somehow reset itself to before the bomb being detonated. The previous events in the past were erased in favor of an alternate timeline. The movie does not attempt to give a logical explanation, and it makes no sense, as most time-travel stories never do, but a "suspension of disbelief" is employed here. We're supposed to accept that it happened. Max is the only character who knows what the previous timeline was like, but he now has no idea of current events (like his wife and son being alive) in his alternate life during the intervening time from when he was in the past and returns to the "new" present.
Question: Near the end of the movie Max figures out that 2004 Mccomb came back to 1994 to make sure that he wins the presidency. Since the first half of the film takes place in 1994, how could 2004 Mccomb travel to 1994 when the TEC hasn't been fully formed yet?
Answer: The fact that the TEC doesn't exist in 1994 is irrelevant - McComb has access to time travel equipment in 2004 and uses it to travel back. There's no apparent limitation on when they can travel to - in the course of the film, we see characters who have travelled much further back than '94.
Question: It is revealed that same matter cannot occupy the same space. Walker carries his other self to safety after being knocked out. Wouldn't this break those rules?
Answer: At what point does Walker carry himself? Present day Walker is knocked out while outside the house. Future Walker kills the guy and then goes into the house. Unless you're talking about a deleted scene, future Walker never moves or touches present day Walker. Future Walker carries his wife to safety and lays her next to the knocked out Walker.
Answer: I'm pretty sure it was mp5 with muzzle brake.