Nobody seems too concerned about changing history and preventing the sinking of the Titanic. This is an issue that will be overlooked throughout the series although in theory it could have significant repercussions on all of known history.
The captain of the Titanic in real life was Captain Edward John Smith. Why the name is changed here to "Malcolm" is not entirely clear.
The names of the Titanic's secondary officers are also fictitious.
Beard seemingly hears Doug coming toward him in the fuel dump, in the vacuum of space.
For some reason the astronaut life-support backpacks vary. Some are two sets of bottles - the other are a single box with a decal/picture of two bottles on them.
When the Time Tunnel pulls out Doug and Tony at the end of the episode, their spacesuits vanish though they're still on the airless moon for at least a couple of seconds. Even in that short amount of time, their lungs should have exploded from being caught in the vacuum of space, yet we don't see them desperately gasping for oxygen.
The rocket that takes off from the launch pad at the beginning of the episode bears no resemblance at all to the one that arrives in space.
The moon has no atmosphere and therefore no oxygen to sustain a fire of the kind that rages following the explosion at the storage facility.
The fight between Beard and Doug at the fuel dump looks perfectly normal, despite the fact their supposed to be in a 1/6ths gravity on the moon.
When Doug goes to investigate Beard at the fuel dump, his suit is a very white white in the long shots, but orange in the close shot. It was orange when he took it from Beard in the ship.
There's not much of a breeze, much less the kind of explosive decompression you'd see from a hole that size, when the ship's hull is breached by the meteroid.
Almost all of the early shots of the MEM show it in a blue-sky atmosphere, even after they announce they are heading for the Moon.
So why don't Jiggs and the present-Doug remember meeting Tony 10 years in the past?
When Tony chases after Doug in the desert, he gets sent on to the next episode...but the 10-years-past Doug and his car vanish too.
The general talks about how Ray has risked his life on many occasions...when? It's only been three episodes, and there's never been anytime before or after that Ray was in danger.
Tony says he was seven during the attack of Pearl Harbor, but in the pilot episode he said he was born in 1938, which would make him three.
Tony states that his father was a Lieutenant Commander. Yet the shoulder bars on his naval uniform are those of a Commander.
Some of the images we see the scientists observing are in black and white (probably from stock footage) which makes no sense considering--as they are so inclined to explain to us in this episode--they are apparently watching the real thing.
When the base personnel are watching a captured Tony and Doug at night, the footage they see suddenly changes to daytime footage of the Japanese fleet. Kirk specifically says that it is the fleet heading for Pearl Harbor, so there's every indication they are seeking the fleet at the same time that Tony and Doug are captured.
When Tony and Doug enter the naval communications center for the emotional scene with Tony's dying father, all outside noise of the bombing raid suddenly stops and there's no background noise at all throughout the scene. As soon as they leave the building, the background noise starts up again.