Picard meets an old flame, whose husband has been affected by a dimensional experiment accident.
Tropes in this episode:
- Absentee Actor: Wesley doesn't appear.
- Applied Phlebotinum: Just like in several Original Series episodes, antimatter is apparently the cure for everything.
- Chuck Cunningham Syndrome: It's unknown how much time has passed since the events of "Skin of Evil", but it seems rather odd how everyone seems to be going on about their day looking reasonably content, despite having undergone the pain of Tasha Yar's death just one episode ago. She isn't even mentioned or alluded to.
- Deus ex Machina: The time anomaly produces three Datas, and only one is in the proper time stream to shut it down. What to do? Well, luckily the one in the middle just knows that he's the right one somehow.
- Eiffel Tower Effect: A gloriously blatant example, where in the holographic recreation of the Paris cafe, the Eiffel Tower is visible in the background in multiple, mutually-exclusive camera angles.
- Gone Horribly Right: Dr. Manheim was attempting to open a door to another dimension. He succeeded, but at the cost of his research team's lives and very nearly the galaxy.
- Must Make Amends: The episode ends with Picard having champagne in Paris (well, the holodeck's version of Paris) with Jenice, like he failed to do many years ago.
- Old Flame: Jenice, Dr. Manheim's wife, is this for Picard.
- The One That Got Away: Jenice. A variation in that Picard let her get away, as he was too scared of settling down and living a normal life with her instead of achieving his dream of captaining a starship.
- Portal Slam: Picard asks if Data closed the dimensional door. Data replies that closed is not appropriate as his solution was not final, but rather the doorway has merely been "patched".
- Shout-Out: The title is from the classic film Casablanca. Picard, Riker, and Troi, looking forward to shore leave on Sarona VIII, talk about visiting the Blue Parrot Café, which was the name of the rival bar to Rick's Café Americain in that film.
- Temporal Paradox: Manheim's experiment creates "echoes" in the space-time continuum. In one case (as seen above), it causes Picard, Riker and Data to meet themselves in a turbolift.
- Unnecessary Combat Roll: Data's response to Manheim's security system is to roll back and forth, dodging the phasers, until he can shoot them down.