In TMP, perhaps for the very first time in Star Trek, The Enterprise is seen going into Warp Drive. Previously in TOS they showed the Enterprise in warp drive but not entering it nor exiting it.
The Enterprise going into Warp Drive in TMP is so beautiful, it literally looks like fireworks.
Exiting Warp Drive looks even more beautiful! And then for some reason (or perhaps no reason at all) they decided that this is not how warp drive should look. The TV series from TNG onwards has a cheaper effect, and even in the rest of the TOS films isn't as detailed.
I just had to comment on it.
The Enterprise going into Warp Drive in TMP is so beautiful, it literally looks like fireworks.

I just had to comment on it.