Halfway through filming, both Bill Paxton and Helen Hunt were temporarily blinded by bright electronic lamps used to make the sky behind the two actors look dark and stormy. Paxton remembers that "these things literally sunburned our eyeballs. I got back to my room, I couldn't see". To solve the problem, a Plexiglas filter was placed in front of the beams. The actors took eye drops and wore special glasses for a few days to recuperate. After filming in a particularly unsanitary ditch (for the first tornado chase scene, in which Bill and Jo are forced to shelter from an approaching F1 tornado under a short bridge), Hunt and Paxton needed hepatitis shots. During the same sequence, Hunt repeatedly hit her head on a low wooden bridge, so exhausted from the demanding shoot that she stood up so quickly her head struck a beam. During one stunt in which Hunt opened the door of a vehicle speeding through a cornfield, she momentarily let go of the door and it struck her on the side of the head. Some sources claim she received a concussion in the incident. De Bont said, "I love Helen to death, but you know, she can be also a little bit clumsy. " She responded, "Clumsy? The guy burned my retinas, but I'm clumsy ... I thought I was a good sport. I don't know ultimately if Jan chalks me up as that or not, but one would hope so".