So, did the supermarket manager and the mechanic survive?
What does everyone else think?
Do you think they were rescued by the military before the other monsters could get to them? The last time we see Bud Brown (the supermarket manager) and Jim Grondin (the mechanic played by William Sadler) they'll still alive and holed up within the supermarket, and it's implied, that of the main characters, they're possibly the only ones, along with David Drayton (and I'm pretty sure he's borderline suicidal by the very end), and the woman played by Melissa McBride and that woman's child.
In which case, I must say I always find it interesting when random and relatively minor, even slightly unsympathetic characters (the manager was okay, but Grondin, the mechanic was a bit of a jerk and one of Mrs. Carmody's disciples), make it to the end alive (since the horror movie cliché is that generally everyone but the hero/heroine, and possibly their boyfriend/girlfriend, and family, ends up dead).