At first I thought that maybe it was the studio lighting that highlighted the flaws of hair pieces in real life but having seen this vid of shatner and following hersutes comments I think they were just poor quality systems.That guy who owns the company has a brother working for RTE which is how he got on the show.

Shatner:http://www.youtube.com/watch?v=7Z7WlstPIWc

Actually just found a video of them on the same show in 06 I think. The pieces actually look pretty good herehttp://www.youtube.com/watch?v=w8L1LqplbMU