B.J.'s affair
I just rewatched this one this morning - I've always though the writing was clunky and it's still clunky writing IMO in retrospect. There's just no way B.J. would have had that affair with that random nurse.
I can see a situation where he might have gotten caught off guard and kissed that nurse, but there's a big difference between an spontaneous kiss and the time when you both start looking for a private place to go, unbuckling your belt, removing your shoes, dropping trou etc. The B.J. we know simply wouldn't have gone through with it. A kiss when caught off guard? Maybe.
The later episode when the war correspondent (Susan St. James) showed up would have at least made *some* sense as a situation where B.J. strayed if that's what the writers wanted, even for someone as loyal a family man and husband as B.J. Maggie was not only beautiful, she was brilliant, sexy, flirtatious, accomplished, cared very much about the wounded soldiers as B.J. did, and made it very clear she both loved and wanted B.J. badly, something most men would have difficulty turning down. B.J. was also falling in love with Maggie, something that was off the table with the random nurse he actually did stray with.
The war correspondent Maggie would have been the better scenario to have B.J. stray if that's what the writers were shooting for. At least that would have been somewhat believable.