I really wish the dealer told/showed me...(post your wishes)

You still have big windows in the UK dealerships.
Here is my previous car being “undressed” to fit the tow bar assembly. Lol.

 

I am about three weeks in with a new (2024) Prius Prime XSE. We have a 2015 which we acquired used in 2018, but this was our first new Prius and our first plug-in vehicle. I got the full walk-through when we picked it up and thought I was in good shape. Brought it home, put it in the garage, unpacked the charging cable and plugged it in for an overnight charge.
Next morning I got up, got my daughter in the car to go to school, spent five minutes trying (and failing) to disconnect the charging cable. Finally we gave up and used the old car to get her to school. I came back home and spent five minutes on YouTube discovering that I needed to hit the unlock button on my key fob (or inside the driver's door) to get the car to release the plug, whereupon I was able to take it to work.
Useful feature, especially if you charge in a public place (or even an open driveway), but that would've been a detail I expected the dealer to tell me!