Films that show people seeing something very important

My Cousin Vinny where Vinny notices something in the picture of the tire tracks that could clear his clients.

The Illusionist where Ed Norton's character realizes that Jessica Biel who has been volunteered to assist him by the crown prince was actually a childhood friend of his.

Rosemary's Baby when Rosemary is at Dr. Saperstein's office and is told the doctor sometimes smells of Tanis root.

Silence of the Lambs when Clarice sees the moth flying around at Buffalo Bills place (basically realizing the man she is talking to us Buffalo Bill).

Couple more from the movie Speed. Both where Keanu Reeves notices the logo on Sandra Bullock's sweatshirt and when Dennis Hopper notices he's watching a video loop and not a live picture.

What lies beneath with the key and pendant from that little town , Adamant if I remember correctly, been a few years since I watched it last. The realisation that she's not crazy but being sent a message.

The scene from The Two Towers when Eowyn sees Aragorn arrive at Helm's Deep alive after thinking he died.

The scene from Split when "Patricia" emerges from the other room and the main female protagonists looks at him in utter horror and shock

Its usually done pretty badly in my opinion