Crew or equipment visible
Incorrectly regarded as goofs
This is not necessarily a plot hole. Since the act was taped in the club it could be reasoned that Arthur had to sign the rights for the publication to the club beforehand. The club could then give permission to the station broadcasting the late night show. This may seem far fetched for the real world, but keep in mind that the movie still takes place in a fictional world, which may have some different laws.