And there’s this:

https://www.reddit.com/r/MovieDetails/comments/leecbe/alien_1979_and_bladerunner_1982_have_identical/

There’s also some commentary from Ridley Scott, one of the displayed replicant body designs in 2049 is clearly an Engineer, and I believe a billboard for Weyland in one of the Blade Runners, but I can’t find that screenshot so maybe I’m misremembering that one.

Most of it is Easter Egg level stuff but there’s enough that it’s canon if you want it to be. Or not.

Really, the biggest takeaway I learned from this connection hunt back in the day was that the Blade Runner humanity had multiple colonies on other planets, which was just not something I remembered being a thing from the movies.