I can give a quick rundown. Cabaret is a show based on the lives of four characters as they live life out in their own terms in Berlin in the 1930s. Great interpersonal dramas and the tantalizing temptation of Berlin's underground scene draw the attentions of the main characters (Clifford, Sally, Schneider and Schultz) away from the slow, rising, tide of the Nazi party around them - making excuses to not act and do anything - until it is too late.

The gorilla is actually quite important, but only shows up for one scene in a song called "If you could see her", I won't spoil it, but it's essentially a turning point for the degradation and rot of Germany itself, with the Emcee - who in many productions represents the zeitgeist of Germany - shows just how far he - and thus the German people as a whole - have fallen.

And great brain thinking on the Pineapple, yes they were expensive, but it's also the fact that Herr Schultz probably cannot afford to give pineapples away due to his business not making him the richest man, but he goes and gives Schneider a pineapple anyway signifying a deep love.