Young Kat's accent is noticeably closer to British than Australian.
Zordon tells the Rangers that he couldn't give them powers while they're reduced in age as children. However later in "Turbo: A Power Rangers Movie" he was able to give powers to Justin who's a child as the Blue Turbo Ranger.
Bulk and Skull don't know who Rocky, Adam, and Aisha are. Do to them not going to the same school, when they were little. However, they know Tommy. Tommy Oliver didn't move to Angel Grove til later on.