Redford's age....
Look, Redford is getting on in years, I understand that. Even when this film was made he was old. You can see the age in his face, which would be fine if he played the role of an old man, but he doesn't. Clearly he still wants to be 30 years old. The romance angle in this movie between him and Mary McDonell is just creepy... a 60+ year old man pursuing a sub-30 year old woman.
Redford has obviously never come to terms with his own age, and consistently tries to play these younger characters. That's a bit sad, and not something you like to watch.
I've seen things that would make you want to write a book on how to puke.