Character mistake: After Pookie is killed (with his eyes open) and the bomb is strapped to him, he blinks his eyes.
Continuity mistake: Jodie Foster has very blue eyes. When they flashback to her childhood, when she is crossing the lawn to greet her father, the girl playing the young Clarice has dark eyes. (00:20:10)
Other mistake: There is a patch on the jacket Harley (Rourke) wears, that appears and disappears throughout the movie. It's on the front lower right side. It is there when he's standing outside their friends' bar with Marlboro, it's gone when they are inside.
Factual error: In the scene where there is a train passing, the cars are marked "Burlington Northern." There was NO Burlington Northern until 1970, 7 years AFTER the shooting.
Continuity mistake: At the conference, when the President is announced, there is a wide shot of the crowd and you see a lot of people standing in the background against the wall. There are also several spotlights turned on. Then it cuts to the stage where Frank and the squad are walking. When it cuts back to the crowd all the people in the background are gone and the spotlights are switched off. The crowd reappears later and the spotlights are on again. (01:00:50)
Visible crew/equipment: When Ricky is shot through the chest, the blood pack is visible bulging through his shirt. (01:28:30)
Factual error: Warren Beatty refers to the "Hoover Dam" being able to generate the power needed for Las Vegas and his Flamingo casino. The problem is that he supposedly made the comment in 1937. At that time, the "Hoover Dam" was still called "Boulder Dam." It wasn't renamed to honour President Herbert Hoover until about ten years later.
Continuity mistake: When De Niro first meets Nolte's lady-friend, they are having a conversation in a bar or restaurant. As the camera goes from De Niro to the woman, the woman's top blouse button is open in one shot, then closed, then open, etc.
Continuity mistake: When the jumper shoots Kuffs before going off the ledge, pay attention to the trajectory of the bullet fired from the gun and then to the bullet wound that Kuffs shows us in the taxi cab. They don't match. If the bullet got him where it was supposed to, he would've been hit in the hip/upper thigh area, instead of the side of his abdomen like in the cab.
Continuity mistake: When Martin Short climbs over the hood of the Jeep, he knocks the windshield glass completely out of the frame. A minute later, the glass is installed as normal.
Continuity mistake: At the western bar Louise is drinking a margarita. As the shot goes back and forth between Thelma & Louise, the contents of the drink magically decrease and increase again. The level of Thelma's coke rises as well, when Harlan leaves them. (00:14:00)
Revealing mistake: During the car smuggling scene where Van Damme is fighting on the boat one of the thugs slides/falls against the side of one of the cars. If you look closely, you can see the side view mirror on the car is made of rubber.
Continuity mistake: After Kevin Kline slices his thumb (finger?) in the kitchen, his wife bandages it. Then, as the earthquake hits, they run outside and you can see that the bandage doubles in size.
Continuity mistake: In a few scenes we see in the background BT Telephone boxes this film is set in the 1960's so why are the boxes new with the new BT logo on them. In fact, BT boxes at all? It didn't exist then.
Continuity mistake: In one scene where a guy is getting his car crushed with him in it, there's a two second scene with a dummy in the car then it's switched back to the guy. (00:12:35)
Continuity mistake: When Richie shoots Bobby on the sidewalk, after he spits on him, he walks to the road to get into the red sports car. Bobby's wife then runs over and gets on her knees to attend to Bobby, there is no red sports car on the road in the background, but in the next shot it shows Richie getting into the car and taking off from the position the car was originally waiting.
Revealing mistake: During the night surfing scene notice that the sun is evident in the background (look closely it does not appear long). There are also shots where you can see clouds and faint blue sky. Moments later you see Keanu and Lori sitting in the water with completely different lighting which was actually taken at night and further distinguishes that the surfing shots were not actually done at night time. I heard the scene was shot during the day with a filter so it looked like it was shot at night.
Revealing mistake: When Rollie is hanging from the ladder and the bolt breaks, you can see the smoke from the exploding bolt. (00:42:50)
Factual error: Pierrepoint is depicted as having a London accent. In real life, however, he was from the north of England, and had a Yorkshire accent, which sounds completely different. This is proved in a BBC interview with him, dating from the 1970s.
Factual error: In the scene where Earl is fighting the other prisoner, he is using a "sword" made from a bar of metal, it has a blade that is well over 2 feet long from the tip to the hilt. At the end of the fight the other prisoner is standing with his back against a solid concrete pillar, but Blake somehow manages to shove the "sword" through him all the way up to the hilt. This wouldn't be possible unless Blake were somehow able to shove the bar into the concrete.
Suggested correction: Eye color also can change with age. This happens in 10 to 15 percent of the Caucasian population (people who generally have lighter eye colors).
Babies born with blue eyes can develop brown or darker eyes as melanin is produced. And while eye color can get lighter with age (older than Clarice usually), a child her age with brown eyes won't develop blue eyes. They could turn green maybe, but not the blue color seen.
I just rewatched the scene you were talking about and they're not blue eyes they're actually hazel and the adult Clarice could be wearing contact lenses.