During lunar orbit, they discovered a rogue poop floating in the cabin [1]:
> Stafford: Who did it? (Laughter)
> Cernan: Where did that come from?
> Stafford: Give me a napkin quick, there's a turd floating through the air.
> Young: I didn't do it. It ain't one of mine.
> Cernan: I don't think it's one of mine.
> Stafford: Mine was a little more sticky than that. Throw that away.
> Young: God almighty.
> Stafford: What do you see?
> Young: Nothing, that's enough for me.
> Cernan: Yes.
> Young: Nice going there.
> Cernan: No more turds are going to fit in there.
> Stafford: Is that waste compartment full?
> Young: No, hell; there's nothing in there.
> Cernan: It goes all the way down to the...
> Cernan: Hell, when I got in there, I had to stick my hand in there and [garble] - He put it in the bag, didn't he? You guys been trying to stick it through there with your fingers?
A few more choice quotes [2]:
> Stafford: [Garble] about that ascent stage. You know that? [Garble] son of a bitch [garble] screwed, you know? But that son of a bitch - John?
> Young: [Garble] burn [garble] God. What the hell is this shit? What? What is that crap those things [garble]? [Garble] putting my [garble].
> Young: Oh, what a life, being a spaceman. Wish I could have been a professor or something.
John Young was also the star of another great moment in NASA history, when he smuggled a corned beef sandwich onboard Gemini III [3]:
> Grissom: What is that?
> Young: Corn beef sandwich
> Grissom: Where did that come from?
> Young: I brought it with me. Let's see how it tastes. Smells, doesn't it?
> Grissom: Yes, it's breaking up. I'm going to stick it in my pocket.
> Young: Is it? It was a thought, anyway.
> Grissom: Yep
> Young: Not a very good one.
> Grissom: Pretty good, though, if it would just hold together.
[1] https://history.nasa.gov/afj/ap10fj/as10-day6-pt28.html
[2] https://history.nasa.gov/afj/ap10fj/as10-day6-pt27.html
[3] https://historycollection.jsc.nasa.gov/JSCHistoryPortal/hist... (page 45)
I bet you there was some PR person at NASA cussing them out when they heard/saw those too.
As for being faithfully archived, well we already have enough moon landing conspiracists without giving them more "evidence" of stuff being hidden during space missions.
https://history.nasa.gov/afj/ap10fj/as10-day1-pt2-earthorbit...
Thomas Stafford drops plenty of F-bombs in the Apollo–Soyuz mission transcripts too, which are faithfully recorded in the NASA archives for posterity.