What I didn't like is that the J references were cited in the 1984 NWT alongside P 46, etc. ABDVg, etc. in the footnotes as if they were textual witnesses.
That's not an oversight.
I believe they purposely listed them that way, so that the typical JW who fancies himself a "scholar" (because he actually reads the apendices of the NWT) will be convinced and not investigate the issue further.
As I mentioned, at the recent elder school in the US, they were all over those "J" references in one of the talks, spending more than an hour on them.
They even "updated" the NWT appendix list: Apparently one of the 237 "Jehovah" insertions did not have any "J" support for it until some time in the past few years, then someone discovered an older manuscript, or a variation of it, or something, so that now all 237 are "supported".
Those in attendance were all ooh-ing and aah-ing....meanwhile, of course, no one seemed to notice that, again as noted above, none of those "J" references were written until well after 1000 years had passed since the original writings of the NT.