When Harm and Meg first park the car next to the fence, the car is 3-4 feet away, allowing Meg to exit. When they climb over the fence, the car is immediately beside the fence (< 1').
When Harm rounds the corner in the Sheriff's car, you can see that the night vision goggles he is wearing are pushed up on his head, but in the shots before and after they are over his eyes.
In the previous episode "Boot" (1/9) Harm was a LtCommander this episode he is only a Lieutenant.
Night vision goggles do not emit light from the front end. To do so would present a very good target and would get the user shot in combat.
To check if an electric fence is active, Harm throws a coin at it. When the coin bounces off he declares the power isn't on. But that would not check anything -- for current flow, i.e. for a spark to occur, the coin would have to touch something energized AND ground (a return path). Furthermore, it's a chain link fence, attached to metal poles in the ground. An electric fence has to have separate wires held away from anything grounded by insulated stand-offs.
Takes place at a closed naval air station in Texas. A large USAF Tactical Air Command insignia can clearly be seen on the outside of the control tower.
When J.D. was captured and forced to climb down the ladder, his hands were tied behind his back making it impossible for him to do that.
Lt. Rabb wearing the rank insignia of a Lt. Commander in the previous episode is not a continuity error. This episode was filmed before the previous episode, the previous episode had planned to be aired later in the season, after Rabb is promoted, but the order in which the episodes were aired was changed due to one of the episodes coincidentally having elements similar to a real life event covered on the news. That episode was aired later as the network did not want viewers thinking the show was copying real life events.