Simon Cowell and Harry Hill interview

The transcript discusses a new West End show featured on Sky News. It highlights some technical issues and previews being canceled but assures that the show will be ready for the public by next Wednesday. The speaker expresses excitement and acknowledges their inexperience, noting that technical problems are common in big shows, which is why previews are held.

What technical issues are mentioned in relation to big shows?

What is the reason for having previews according to the speaker?