So, last week I had recourse to Wikipedia's entry on The Inklings to quick-check something and found some interesting errors in its list of Inklings.
For one thing, it includes someone I've never heard of before named "Percy Bates" as a member of the group. Checking Bates' own Wikipedia entry, I find he was a shipping magnate and director of the Cunard Line (whose most famous ship was probably the Lusitania). There's no mention of the Inklings under his entry, nor in the Inkling entry is there any justification for including him in the list of second-tier members. So this seems to be an error, pure and simple.
For another error, more understandable but just as wrong, the Inklings entry includes G. K. Chesterton's name as someone who visited the group (along with Eddison and Campbell, who really did attend at least a time or two*). While they no doubt wd have been delighted to have had him (and he might have enjoyed this meeting of the minds as well), he never attended even a single meeting.
It's not really an error, but so long as it's going to mention guests, the article might be improved with listing some folks we know did occasionally visit, like George Sayer or Roger Lancelyn Green,
At least they don't make the old mistake of listing Dorothy L. Sayers as a member or visitor.
*interestingly enough, T. H White was once invited to visit but never seems to have done so.