Most definitely. I'm currently reading a memoir myself, and it has surrealistic elements which the author has very much intended to include. Just to add on to what's being said above: motifs, symbols and even metaphors are just devices for capturing a feeling or even combinations of feelings, which then take shape as an idea. Everything in writing is infused with feelings and are carefully selected for that reason. Otherwise, there wouldn't be anything special in the act of reading at all (unless you're in academia). But just going back to your example with the coffee, if you point out the mundane detail of coffee for your essay, it still has to contribute meaning to your analysis (I'm assuming this has to do with schoolwork). Perhaps, rather than looking at 'the coffee motif' as just another 'motif', think more of the idea surrounding it, ie. quotidian rituals, the author's growing weariness towards his work, criticism against modern society etc.