I’ve created an Anki deck for some details of BX D&D, using OSE as my reference. I’ve only covered those things that I found difficult to remember, which I suspect are “those things where it differs from Lamentations of the Flame Princess and/or 3e or 5e”.
You can download it as a zip file here:
(that includes a text file with all the cards, one per line)
The Wrong Kind of Wax 