Abandon Shipping: Jasmine used to be the most shippable Dekaranger, that is until every pairing with her got abandoned in the 10 Years After upon confirming that she's now married with Hikaru, of all people.
Complete Monster: Agent Abrella sold many weapons supporting galaxy-destroying wars for fun and profit to most of the Alienizers, regardless of how many lives were taken. Once a galaxy is destroyed, he moves to the next to generate profit and destruction. Abrella treats any and all crime as a business opportunity, and it doesn't matter if you're destroying cities, selling slaves, pawning stolen merchandise, or filming child pornography, as long as the price is right, he'll be more than happy to sell you the tools you need to further your enterprise. And his Villainous Breakdown near the end of the series was caused merely because the Dekarangers were ruining his transactions. Yes, Abrella himself caused a citywide destruction spree and nearly destroyed the whole of the Space Police just so he could keep his job.
Hilarious in Hindsight: Originally, the planned name for this series was "Sirenger". However, this was changed due to the fact that there was an Eroge by the name of Sirenger. The full name of the visual novel, ironically enough, is Tokumei Sentai Sirenger.