In the opening sequences the "sun" appearing over the horizon was actually a light bulb rising behind a miniature.
Life. Don't talk to me about life.
The person operating Zaphod's third arm can be seen on multiple occasions.
Animator Kevin Davies, credited from episodes four to six, receives a different, humorous title each time. The job titles are: Mouse Trainer, Milliways Catering and Bath Superintendent.
At the time of filming, BBC policy was that all comedy shows should have a laugh track. The first two episodes were played to an audience of 100 people to record the laugh track, but it was never broadcast in this form.