Would have been nice to see the evil versions of the crew ,and Worf's reactions to them.
I agree!
I also would have liked to have seen an alternate universe that Worf jumps into where the Federation is at war with the Klingons (sort of like that Yesterday's Enterprise episode), and he finds himself on board a Klingon ship where he is ordered to fire at the Enterprise, but refuses to do so.
Picking up on that, I always thought the one trick missed by "Yesterday's Enterprise" (apart from getting Geordi's uniform right in the last scene

) was not having Worf be shown in command of the Klingon ships that are about to destroy the
Enterprise-D right before the
C re-enters the anomaly. That would have been a great final twist of the knife (or
d'k tahg if you prefer).
I agree that would have been awesome. There is a novel involving Q and Trelayne called
Q-Squared where they revisit the
YE parallel universe and we meet the Klingon Empire Worf there, and he does have a big physical fight with Picard.
One more thought about the so-called Mirror universe. Had they included a scene where Worf finds himself aboard such a ship, it would have been too distracting and different. The point of
Parallels was to have Worf bounce through mainly familiar but different enough universes to disorient him. However, it was a nice touch to have the Borg-infested universe version of
Enterprise and a crazed Captain Riker to show that there are indeed wildly divergent quantum universes.
I just watched the ep and a few other questions came to mind. Troi says to our Worf that if he succeeds in sealing the quantum fissure, there was a good chance her Worf wasn't coming back. What do you think?
Second, Worf asks Troi to formally become a guardian to Alexander (soh-chim) in case anything ever happened to him. Now, since that request happened in an alternate universe, did Worf ever ask her again?
Third, when all the alternate
Enterprises were breaking into that one universe, our
Enterprise contacts the
Enterprise where Worf is first officer contacts, yet there's Worf on that bridge. Does that mean there were several other Worfs bouncing into different universes? Might explain all the Worfs we see briefly on the shuttlecraft
Curie. Did they all return to their quantum universes?