Revealing mistake: A sign's wooden support gets shot at the beginning, but you can see where the pre-prepared weak point is in the support before it gets "shot."
Revealing mistake: Leatherface attacks the Mercedes. The pick up is driving backwards without the reversing lights coming on. Most likely a reversed shot.
Answer: No, the hitchhiker was killed in the first movie when he's hit by a truck. His corpse is the body that Leatherface uses as a puppet during the opening scene. (He's nicknamed "Nubbins.") Chop-Top is supposed to be one of Leatherface's other brothers. According to director Tobe Hooper, Chop-Top was away in Vietnam during the events of the first movie.
TedStixon