In order to get the background skies looking suitably stormy, the truck cab sequences had to be flooded with high-intensity lighting for contrast. As a result, Helen Hunt and Bill Paxton suffered minor retinal burns through much of the filming.
The original Director of Photography was Don Burgess (best known for his collaborations with Robert Zemeckis), but he and many other crewmembers walked off the set midway through filming after a series of heated arguments with director Jan de Bont.
While the truck is being driven through the house, there is a quick shot where a chair is still sitting upright, against the wall, even though the house had just been rolling and ended up on it's side.
When the Dodge Ram pickup's speedometer is shown for the first time after Bill floors the accelerator, the "Air Bag" light is on. This was to facilitate driving the truck through the house later in the movie without the chance of the airbag firing.
At the beginning of the movie during the crew camp out, the weather changes in some shots. The sky changes to fully cloudy, partly cloudy, and clear blue sky.
What are the differences between the British PG DVD and the Uncensored Version?
A
In order to secure achieve a PG rating the word f*ck was removed twice from the soundtrack of the UK DVD. A detailed comparison between both versions can be found here.