Oh, this sounds fun
I‘ve once put a little thing to retcon later in my comic‘s very first chapter, including Josi's online tag "Salamander", since there are some things going on with the digital space later down the road. Also, with the exception of 1 other name in that chatroom, all those characters do not appear until Part II.
An explanation on why she uses that name - as well as the significance of this seemingly innocent chatroom - will still get explained in Part I, but it won't hold much relevance until a whole lot later. (Except, if you count in things such as animal motifs and symbolism, then it is pretty much relevant but that's besides the point lol)