When John flashes back to his last anniversary with Sarah, she says that she can't believe they've been married for 17 years. But the card Taylor gives to John says "Happy 16th Anniversary".
When Simmons places the rock on the live wire (carrying 16,000 volts) to secure it, the back of his fingers make contact with the deadly wire.
John stops to admire a sunset over the ocean. Although Turtle Bay's location is unspecified, the viewing audience does know it's on the East Coast and is presumably Maine due to the presence of bears. It's not possible to see a sunset over the ocean. However, the show was filmed in Parry Sound, Ontario, which overlooks Georgian Bay off Lake Huron. From this location, it is possible to see the sunset over a very large body of water.
After the power goes out at SAR headquarters, John phones Charlie to see if the power is out city-wide, which Charlie confirms. Then John checks the circuit breakers, which he has just confirmed are not the problem.