Factual error: The ship goes to rescue someone 3000 light years away. But the shockwave from the 9th dimensional matter explosion is estimated to reach earth in 51 years. It would travel at light speed or less.
Factual error: The scene at the very end of the film where Billy is grassed up by Alex Kingston. I live in Essex so know that you cannot see Ye Old Plough House (the motel) from Southend Sea Front (the phone box).