Power Rangers Dino Thunder/Fridge

Fridge Brilliance

 * Why did Lothor only bring only bring Zurgane back with him? Choobo was incompetent, Vexacus couldn't be trusted, and Motordrone was a machine.
 * What about Shimazu? They did bring back the Wolfblades, after all.
 * Why does Tommy's morpher have a key? Because his last set of (original) powers was Turbo, and they had keyed morphers as well.
 * Mesegog's unusual speech patterns could be explained by . If had Aspergers Syndrome to begin with, then when he had a physical transformation, it wouldn't have necessarily had to rewire his brain. In other words, it would have been  inside of Mesegog's body. So why would Mesegog have acted like a different person? Multiple-personality disorder.  created the alter-ego of Mesegog after the trauma of seeing himself as a monster. Mesegog was his repressed hatred and paranoia, possibly from Aspergers Syndrome itself, since the disorder can be accompanied by paranoia\depression\schizophrenia. If that were the case, then Mesegog would also have Aspergers Syndrome, and his speech patterns would simply be a variance on that.
 * Linkara's views on Dino Thunder, especially towards the end, shed some light on some matters.
 * The Evil White Dino Ranger's Phlebotinum Breakdown is the result of the Morphing Grid not being able to handle two White Rangers.
 * Trent's refusal for help initially is his mentality that he's a superhero and that superheroes never need help.
 * His explanation for Tommy's persona, especially with Fighting Spirit. In short: Becoming the Mask.
 * Also, Tommy needing to learn to fight for his own life is a reflection of one of his more subtle traits in the old days - guilt over his actions while under evil influence led him to be willing to stick his neck out very far indeed for others, yet reluctant to have anyone else risk themselves for his sake.
 * Why did it take the raw power of the Dino Gems to defeat Mesagog in Power Rangers Dino Thunder? Well, Mesagog wants to bring the world back to reptilian domination, just like when dinosaurs ruled the Earth. Now, what helped kill the dinosaurs? A meteor, of which the Dino Gems are fragments of.
 * Problem: The Dinogems got their power from being what wiped out the dinosaurs, by your logic they should have gained power from destroying Mesagog.

Fridge Logic

 * Tommy, a scientific genius? Not only does he have a PhD, but he gets it a year early. Wasn't this the same guy who could never remember anything?
 * You could chalk it up to a number of things. Maybe the Machine empire's brainwashing for the "King for a Day" ep made Tommy smarter, and maybe Hayley tutoring him helped him with memory problems. Maybe Tommy has hidden depths we were never shown. Maybe TJ, Carlos, Ashley and Cassie managed to get something figured out for the past two teams post-Coundown to Destruction, maybe Tommy studied extremely hard, maybe Anton bribed someone after hearing Tommy having encountered Ranger business before, which would contribute to the Tyrannodrones (Putty Patroller experience) and the Bio Zords. Plus, bad memory dosen't equal dumb and it had been something of a Compressed Vice in the first place anyway.
 * Arguably, this could be Fridge Brilliance as it shows his growth as a leader. His forgetfulness was usually manifested by being lat to Ranger battles due to the Sentai footage of the original Green and White Rangers. It's reduced a bit later as the White Ranger since they had to use original footage for all but the Zord battles. Once he became the Red Ranger, he was usually on time.