Other mistake: In the beginning of the movie, while showing Walker's partner Atwood comparing the October 30, 1929 paper with the October 30, 2004 USA Today, Atwood circles Mid States Oil. The problem with this is the fact that October 30, 2004 falls on a Saturday, and USA Today does not print a Saturday paper. Instead, on Friday, it publishes a paper for the entire weekend, and it states Friday, Saturday, and Sunday on it.
Other mistake: When the man is in front of the Senate committee asking for appropriations for the Time Enforcement Commission, he states that you can not go into the future as it has not happened yet. During the scene with Atwood scanning the USA Today, the date on the paper is October 30, 2004. So, one could assume that this is the current date. Later on in the movie, there is a news report on the television with the woman stating that McComb's campaign might be denied federal campaign matching funds, and that McComb might have to withdraw from the race. Now, being that the election is only three days away on November 2, 2004, it would be a little too late to withdraw from the race, not to mention the lateness in the determination if he is eligible for federal campaign matching funds.