In the 29th minute when Brendan meets Dr. Fuchs and the latter smiles, in the next shot from behind Fuchs one can clearly see that he is not smiling.
In the 88th and 89th minute Brendan introduces himself to Dr. Fuchs as 'Brandon.' Fuchs then asks, "...Brendan, right?" To which Brendan says yes. This may, however, be intentional based on the surreal and cerebral story.