Peter and Harry, former friends, at each other's throats. As well as when Harry shields Peter with his body and they make up finally at Harry's death scene.
Aunt May consoles her nephew after his recent downward spiral due to his usage of the symbiote suit and tells Peter to forgive himself and that she believes that he will set things right again.
Peter losing his temper with his landlord who has asked him about his overdue rent. The landlord is clearly crushed, and slowly says that Peter's a good boy, and clearly something is wrong for him to be acting like this.
It's a bit depressing seeing how head over heels Ursula is for Peter, especially during his symbiote-induced craze. She's barely able to contain herself around him and is lapping up all of his attention, baking him cookies and feeding him. And Peter doesn't actually have feelings for her.
Not a part of the movie itself, but rather the DVD release. The commentary track ends with the cast hoping that they get to make another movie. Ouch.
In a storyboard, the 4th film would have Peter getting evicted from his apartment. Yes, this scene has a sad Ursula in it.
Four years after the film was released, Cliff Robertson died. It's sad watching his role knowing that it was his last.