1991 Geo Prizm Window falls off track

Remove door trim which conceils door handle, then handle (screws).
Remove window crank or PW switch.
Remove door handle (screw, then push foward).
Remove plastic trim piece near mirror adjuster.
Panel "pops" out, it is held in place with plastic trim rivets.

Window is bolted in, you may have to replace regulator, which (I think) you can get from Toyota, GM would not have it.

You can probably get most parts from Toyota, since the Prizm and Corolla are mechanically identical.