in 100 g of baked potato theres like 167 cals. But usually they are about double that weight ... some even bigger. I had a SMALL spud last night and it was 200 grams.
Coleslaw - depends really, its quite high in cals.
Salad, not many at all if it consists of just lettuce, cucumber and pepper for example - calories start racking up when you add the dressing.
to hazard a guess I would say 550 cals ... if its only about a table spoon of coleslaw and no dressing, meduim spud.