In the first cut video of "An exploration of the Life of Percy Ludgate"
  there are three errors:
(1) Babbage's Mill was 8ft dia, whereas the presentation says
    the central ring gear was 8ft dia -- the ring gear is actually
    about 2ft dia.
(2) The presentation says Babbage's store would be 500metres long,
    whereas it was meant to say 500ft. Note there are also some
    differences in opinion on this. Some say 250ft, whereas Doran
    Swade (builder of London Science Museum's Difference Engine)
    said 450ft (for 1000 numbers) in Hanna Fry's BBC documentary
    "Calculating Ada" (17-Sep-2015), here rounded to 500ft. The
    numbers were/are actually correct in the online Ludgate document
    in this catalog, and the presentation correctly said it would
    be twice the length of Westminster Cathedral (230ft), so it was
    clearly an unintentional verbal slip.
(3) The presentation says Bridget Ludgate nee Buckley was from Doneraile,
    whereas it should say she was from Douglas, south of Cork City.
    See the Extended Discussion in the online Ludgate document in
    this catalog.

There are also a couple of finer points:
(3) The presentation says Ludgate was "fond" of his brother Frederick,
    whereas it meant to say "close", a very minor difference.
(4) The presentation says that Ludgate studied accountancy from 1914,
    whereas it is only known that the B.Comm courses in UCD took 3yrs,
    and at that time the Rathmines College of Commerce had a much
    greater role than UCD in accountancy, and in fact Prof.Oldham who
    set up B.Comm in UCD after it was founded in 1909 had been the
    Principal at Rathmines from 1901-09, so it's likely but not
    certain Rathmines accountancy took 3yrs. This will be expanded
    upon in the online document on Ludgate in this catalog.