Plot hole: For the past 5 series, Bulk and Skull have been in every episode. They've seen villains from other galaxies (Lord Zedd, Rita Repulsa, The Machine Empire, and Divatox) who have all sent monsters to Angel Grove and threatened Bulk and Skull on countless occasions. They've even been turned into monkeys and made invisible by space creatures. Why do they feel the need to spend Series 6 seeing if alien life exists? Surely 5 series worth of aliens is enough proof?
Plot hole: Andros leaves the Shuttle on the remote planet, then later returns. Not long after the Astro Megaship lands, it is attacked - the Rangers quickly retreat and take off. The Rangers could not have formed the Astro Megazord later on in the episode, as they left the Space Shuttle on the remote planet (the Shuttle serves as the head of the Astro Megazord).