If you are tempted to use more than the recommended amount of caramel, be extra careful when inverting the tarte prior to serving. Adding extra caramel sauce can turn into a mess on the floor fairly easily, especially if your serving dish is flat.
You can try to make this dessert with other quartered fruits, like peaches, although be wary of the water content in the peaches as they cook. The end result will be much more soupy than the traditional version made with apples.
It helps to keep a baking tray on a rack below the tarte while it bakes, just in case you have any spillage.