When the van driver says he is ready the vehicle is pointing towards the beach but when he leaves it has been reversed down the ramp.
Pouring water on to a keyboard would only short circuit the keyboard, it would not cause damage to the computer system it was attached to.
The van could not get too the beach as it is gated off to all but official vehicles.
The birds on the beach seen in a few scenes do not react to the Silurian sand scorpion in any way.