I'm not too sure if the looks of any dye kits have changed but I doubt it,wasn't too much of a collector of those in the first place so I've only seen a few worn.Their effects must have remained the same though.
I do know the awesome mutant (+1 to all skills) dye kits don't drop in 1.5,but it's possible to have a functional one in 1.5 still.Either characters who have said dye kits can be loaded into 1.5,the dye kits themselves can be traded over,or both.Probably both.
Now as regards bugs,since 1.5 has been in beta for quite some time all/nearly all of the possible bugs have been discovered.Sadly a few of those can not be fixed without extensive work on the devs' behalf,and most devs are occupied elsewhere for the time being.
You're still welcome to keep notes of whatever peculiarities you come across though ^^