Left in charge of the ship, Mr. Spock uncharacteristically browbeats everyone on board just for being human (seemingly not free of emotions as he's always claimed). Given that he's the science officer and that the Enterprise orbits a planet whose very existence is inexplicable, it's reasonable to hypothesize that he's getting back at Kirk for leaving him out of the away mission by belittling the crew at every turn, thereby becoming a character ruled by the emotion of bitterness.
The Enterprise was thrown 990.7 light-years from the planet they were investigating, then return in about 1 day. However 7 whole seasons of Star Trek: Voyager were based on the idea that it will take 70 years to travel 70,000 light-years. With the rate stated in this episode, Voyager should've passed that distance in little over a month.
During the opening "earthquake/storm" scene (as soon as landing party beams down), when the lightning flashes distinct shadows can be seen on the "sky" behind the rocks, emphasizing the fact that it is a fabric backdrop/screen.
They bury D'Amato and paint his name on a stone atop a memorial rock pile. Where would the landing party get black paint and a brush on a uninhabited planet when all they are carrying are two tricorders and McCoy's medical pouch.
The goof items below may give away important plot points.
Lt. Radha's countdown of the final minute before the engines overload does not match the elapsed time of the scene. e.g., she states 57 seconds to overload, then 79 seconds later she says 20 seconds; then almost another minute elapses to zero.
After the spot where Kirk tries to phaser out D'Amato's grave turns out to be impenetrable, he tries elsewhere with the same result. This is actually the same spot from two different camera angles. Notice that hole as well as the rocks surrounding it are the same.