In the last panel of 728 you can see Roy wearing Haley's bow, which she lost in 713. It's knocked off of Roy's back in 729 and it's on the floor in 732. She has it back in 750, though she doesn't use it. Presumably Durkon picked it up at some point and returned it to her.
Also, 750 has an appearance of Haley's sap, which others have chronicled the history of.

And the entire Gladiator subplot has the same background characters running through it. Evisceratus, for example, actually had several lines and a slight personality.