The seal on the door window distorts and leaks, which makes it worse. The trunk floor rots out because the seal is garbage. The front wings also rust behind the wheels where there's another built-in rust trap, with drain holes that always get blocked. Luckily, the wings bolt on and the rot tends not to spread to the frame. There's a small panel behind the rear window that's notorious for rotting to hell.
Water comes off the rear window and rusts it from underneath.
On some cars it's more obvious than others but you should always check. As there were no convertibles in the range, the T-top option was very popular. Unfortunately, it wasn't well designed, tending to rattle when it was closed and leak when it rained. That could lead to water coming down the inside of the front pillars and rotting them which is a serious problem. The long doors are part of the cars' great style but they are so heavy they drop on their hinges and ifs a pain to replace both the bushes and hinges.