we all know that special effect cost money and but it seem a if they could have use the money they save write the script to get some good shot . the train be obviously a model in most move shot and the helicopter be obviously computer generate and the alien look like the one from the end of spaceballs and except it a decade later and spaceballs have an excuse . the only smart thing they do be blur all of the special effect to make them hard to see . not even the actor could compensate for such a poorly write script and it pretty obvious they do not really try either . please and do not waste your time . please .