Factual error: Aunt Petunia says that the chalice was first seen in the Stone Age, and sends Paul and Barry back to where Stonehenge is just being completed. However, the Stone Age actually ended in around 3300 BC. Stonehenge is believed to have been constructed in around 2500 BC, which was the Bronze Age.
Chucklevision (1987)
1 mistake in season 20
Starring: Barry Chuckle, Brian Patton, Jimmy Patton, Paul Chuckle
Magnetic Distraction: Part 1 - S15-E5
Trivia: In the episode "Magnetic Distractions Part 1", when Paul and Barry are in the shop with all the TVs, and Barry keeps accidentally changing the channels, one of the channels he changes to has footage of the boys playing football from the episode "Football Heroes".