The Gypsy Moth Aeroplane is shown as having registration of G-AAHY. This is factually incorrect as was only registered in 1954. As the show is based in 1929 the original registration HB-AFI should have been used.
The grocers van has registration VY4107. This vehicle was only built in 1930 yet the program is based in 1929. So although nearly correct it is still one year out so is deemed a factual mistake.