This Star Wars page at the Indiana Jones wiki lists various references to the one franchise in the other, and vice versa.
The Lucas-executive-produced John Korty movie
Twice Upon a Time features a character called Ibor, a furry, gorilla-esque robot with a TV screen for a face; the physical design seems somewhat inspired by the title menace of the '50s schlock sci-fi movie
Robot Monster. Ibor communicates through video clips from movies, TV shows, etc. on his screen, and one sequence has him showing fleeting moments from both
Star Wars - Episode V: The Empire Strikes Back and
Raiders of the Lost Ark.
A few years later Lucas was executive producer of the notorious
Howard the Duck (written, produced and directed by Willard Huyck and Gloria Katz, known around these parts for
Indiana Jones and the Temple of Doom), the earliest scenes of which are set on Howard's home planet of Duckworld, which is like ours but full of anthropomorphic ducks, and there are terrible duck puns everywhere. Howard's apartment has various movie posters on the wall, including one for "
Breeders of the Lost Stork," with artwork parodying the classic Richard Amsel illustration for the original
Raiders 1-sheet.