The Flash Season 2: 11 Big Questions We're Asking After 'Flash Back'
6. Will The Show Ever Establish Proper Rules About Time Travel?
This follows on from the lack of significant consequences, but it's been a recurring issue with The Flash whenever the attempt a time travel episode. It's always fun and leads to some exciting drama and all that, but they basically play fast and loose with the rules of what can and can't be done, choosing them to suit their narrative needs.
We've seen things change to massively varying degrees, or not at all, and while it tends to work for each individual episode, it'd be good to have some coherency as to what exactly the ramifications are (or aren't) of Barry going back in time.