Well, if you want some constructive criticsim, I'll take a shot at it.
Work on the transitions, a few of them were rather jarring the way the frames went from one to another. The bubble transition.. thing, near the start was unneeded. Never use anything like that, in my opinion, just clean cuts.
The text you added was hard to read due to coloring / size.
Music was overpowering in some parts and the entire thing didn't have something "binding" it all together, music and background noise was going up and down, this way and that, all willy nilly.
Your also right in that it's not a trailer, more like an episode recap, considering it shows everything. Maybe try making those, over a trailer? Not saying you can't make a trailer, this is just nothing like one.
Overall, work more on making it bind together and have a sort of theme. The volume, background noise / music, colors, fonts used, etc... These all need to mesh together and not jump all over the place.
Hope that helps.
