Coincidentally, the source novel, 'One Shot' by Lee Child, specifically references (though not by name) the film A Few Good Men (1992), which starred Tom Cruise. In the novel, Reacher reflects upon a line of dialogue spoken by Jack Nicholson's character.
The "highway bridge" the sniper should have used is the I-279 bridge. It is shown to have the sun behind it (west) in both the original shooting and the hypothetical discussions. This would mean it's evening (sun is low in the sky, during summertime) - not the morning, as indicated by the shooter's watch and the victims' stories.
When the coin is originally placed into the parking meter, the limit on the meter is marked as 30 minutes.
Later when the police find the meter it reads 10 hour time limit.
When Jack then goes back to the are in the car park where Barr set up to fire the meter once again reads 30 minute time limit.