I’ve searched high and low for references to this scene and what others took from it, but it seems no one else in the entire universe has picked up on it (at least not anyone that feels the need to share every waking thought online, anyway).
There is a scene where Mary walks over to Dr Mierzwiak’s car to chat with him. Shot from Stan’s perspective, they both look back at him and laugh amongst themselves, with Stan and the viewer unaware exactly what it is they’re laughing about. At some point in the film (it’s been a while), Stan confesses his love for Mary. In my mind, the clear implication from the conversation between Mary and Dr Mierzwiak is that Stan has at some point had Mary erased, and is now unknowingly falling for her again, something Mary and Dr Mierzwiak find to be comical.