Watching Indiana Jones right now, and Marians comments like "I was just a child" and Jones' falling out with her father seem to indicate that Jones fondled a child in the story. Which... uh. What the hell? It's not even like a big part of the plot, it's just thrown in
I only noticed on a recent rewatch, as a kid they just registered as "adults" to me
Even now i see Laura Dern in that movie as a 30 something in good shape and Neill as a guy in his later 40s, so yeah I never thought it was a creepy age gap personally.