I'm sure I do, but inconsistencie s with characters and plot usually aren't my problem - I have a pretty good memory for details, and I do a lot of outlining, rereading, and fact-checking, which helps with that.
What annoys me about my older stories are things I could have done a much better job at researching in order to write accurately and did not. One of my early fanfics was a story about Brian getting addicted to painkillers, and being a naive 15-year-old at the time, pre-AJ's rehab, all I really knew about drugs and addiction were what I'd learned in DARE and 9th grade health class LOL. Needless to say, that story is embarrassingly bad. Even with Broken, I put a lot of effort into researching Nick's medical issues and, other than giving him a type of cancer that is more common in children, did a pretty solid job of it, but I dropped the ball on Claire's side of things. This is why I don't write anything without looking it up nowadays and probably spend more time "researching" than I spend actually writing LOL.