It is a conflict of interest and not recommended for a committee member to serve as a reference as well. Please ask the candidate for additional references if necessary and notate that the committee member did not serve as a reference. It is important also that the committee member only uses information from the search to evaluate the candidate and remains unbiased.
Only the Search Committee Chair is public knowledge. The committee can determine to disclose their names, but it is best practice to only share contact information for the Chair.
You don't have to get hotel rooms for internal candidates, however they should be treated fairly as far as dinner arrangements go, campus tours etc. They can decline a campus tour, but you can offer it.
