Grant's old car was one that Stephen Kendrick found and "dressed up" to look really pathetic. It really wasn't working very well and was hard to get around to different locations.
Though "Facing the Giants" is not a true story, and some people think that certain parts are unrealistic, just about every "Miracle" or amazing event in the movie are things that they really have seen happen in real life. These include: a coach being given a car, the revival scene, the wind helping a field goal, couples having children after being told they never would, and where Mr. Bridges shows up to tell Grant a message from GOD through the book of Revelation (this was based on an event that really did happen to Jim McBride at Sherwood Christian Academy).
The truck that's given to Grant had been borrowed from a nearby used car lot. It was sold before they got to film the later scene where it's shown again. To borrow it again they had to track down the buyer who was in another city.
Before the final play of the game they say that there are only two seconds left. When they show the score on the scoreboard you can see that it says 5:12 left.
During the Giants final drive the quarterback #11 is seen on the sideline behind coach Bobby Duke as he calls in the play. Then he is magically back on the field to run the play.
The shadows on the title sequence are backwards. If the letters in the name "Facing the Giants" were truly back-lit by the lights in the stadium, the shadows would be upside-down, not right-side up.
Grant Taylor: We weren't supposed to have a winning season, but we do. We weren't supposed to advance to the playoffs, but we did. We're not supposed to be here, but we are.