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Mary and Rose talking with Raylene while the main character performes his special job is also something that fires at random and won't happen every time.  I don't know the frequency but it's less then half the time.  You can check to see if the scenes are unlocked by seeing if they're available in the theater in the bunny mansion (you will have to pay to open up the theater).  Unfortunately, the theater does not have dialog so you have to see the actual scene for the full experience.

I also think that who shows up is time dependent but I'm not sure.  If you perform a special job in the afternoon then Mary might show up but if you perform the special job in the evening then Rose might show up.  At-least that's what I think.  I haven't bothered to figure out what the chances one of them show up is but I would say that it is less then half so if you perform the special job a few times then one of them will eventually show up.  If someone knows the actual chance they show up then that would be great.