Donald Crowhurst did not live in Teignmouth, as the film suggests. He lived in Nether Stowey, near Bridgwater in Somerset. He didn't want to leave from Teignmouth. Mr Hallworth, his agent, was PR officer for Teignmouth council and persuaded him to sail from there.
When the Teignmouth Electron is leaving harbour, the yachts in the background have a stern shape that's about 40 years too modern.
At 8:45, Donald Crowhurst pulls into a petrol station with a trailer attached to his vehicle. Two orange Ratchet Tie-Downs (or Ratchet Straps), are clearly being used to keep the items from falling out of the trailer. Ratchet Tie-Downs were invented in the 1980s.