Did TPTB time-travel to film a younger Walt?
It sure seemed like it, in "Meet Kevin Johnson". Either that or there are two other options. They did some great CGI work on Big Walt, to make him look like baby-cheeked Little Walt -- or -- they knew where the Michael/Walt story was going to lead back in Season 2, and they shot some scenes with Little Walt before he got big. Whatever they did, and I hope that they tell us in a future OLP or LOST magazine, it made for an interesting moment in the episode. At least I thought that it was pretty cool. Walt used to be just a little tyke, and handsome Taller Ghost Walt is no kid anymore! I thought that seeing Walt little again was more fun than finding out that Tom was...um...in New York. If anyone hears how they did it, spread the word. Tx.