The Sheriff and Chief go into Happy Trails investigating the break-in and when they're talking to the owner and he happens to say "I just got my power back on". Then as the Chief and Sheriff leave the building you can see an electrician working on the electric meter and the meter is not installed. No meter no power.
The supposedly heavy box of guns Raymond Mercer is carrying, bounces off him like a book of styrofoam after he's shot twice and falls backwards.
In closing shot, a photo on the wall of chief's office appears to be Ron Steiger in police uniform like he wore in ITHOTN movie.