Dark Specter's Revenge: Part 1 - S1-E29
Factual error: Bulk, Skull, and the Professor try to get in a Apollo Saturn V rocket to escape Earth. They head up the tower, and are seen getting into the ship via the thin pillar at the top - this pillar was used in case there was an emergency early on in the launch. Astronauts got into the ship in the Command Module, which was slightly lower down.
Crystal Blue Persuasion - S3-E15
Factual error: When Frank, Olga and he rest of the Back Step Team meet Commander (a Navy O-5 Rank) William Streck, he is dressed in a U.S. Air Force Uniform with the rank of Colonel (O-6).
The Origin of the Silver Surfer: Part 3 - S1-E3
Factual error: When Silver Surfer is battling Galactus just outside the Earth's orbit, Surfer is depleted of his Power Cosmic and looks to draw energy from the sun to replenish it. The sun is pretty close to the Earth's orbit, when in reality it is 93 million miles away.